JPH022011Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to an extraction type circuit breaker, particularly to a positioning locking mechanism.

Conventionally, in an extraction type circuit breaker, the main body of the circuit breaker is connected and tested by connecting the operating handle to the worm shaft from the front and driving the worm wheel shaft via the worm by operating the operating handle. , which is extracted and inserted into each disconnection position, is equipped with a positioning locking mechanism for stopping and holding the circuit breaker main body at each operating position.
As disclosed in Publication No. 19400, a locking hole is provided at each operating position in the lock cam plate integrally attached to the worm wheel shaft on the circuit breaker main body side, and a locking pin is engaged with this locking hole. The worm wheel shaft is configured so that it does not rotate at the operating position, or it is stopped at each operating position by engagement of a lock pin with a locking hole provided between the circuit breaker body and the fixed frame. , is configured to hold.

Problems to be solved by the invention: The force that the operator uses to rotate the worm shaft using the operating handle is magnified and amplified by the worm and worm wheel, so the locking member must have sufficient strength to lock in this position. Must be strong. Therefore, the diameter of the lock pin has to be increased and the thickness of the lock cam plate has to be increased, resulting in the disadvantage that the locking device inevitably becomes larger.

Means for Solving the Problems Therefore, the purpose of this invention is to overcome these conventional drawbacks and to provide an extraction type circuit breaker that can be sufficiently engaged and held at each operating position with a small locking member. The object of the present invention is to provide a positioning locking mechanism.

To summarize this idea, the positioning locking mechanism is
An extraction type circuit breaker includes a lock cam mounted on a worm wheel shaft and having a positioning groove on its periphery, a lock lever that is rotatably supported and has a lock pin on one side that releasably engages with the positioning groove, and a lock lever. The stopper pin is provided to interlock with the worm shaft and biased by a stopper spring to the worm shaft, and a plurality of engagement recesses are provided around the worm shaft so as to be releasable from the stopper pin, and the lock lever is connected to the positioning groove of the lock cam and the lock lever. The stopper pin and the engagement recess of the worm shaft engage with each other at each operating position where the lock pin engages with the stopper pin.

Other objects, features and advantages of the invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

Embodiment As shown in FIGS. 1 to 3 of the drawings, in the positioning locking mechanism of the extraction type circuit breaker of this invention, the circuit breaker has a circuit breaker body 1, a fixed frame 2, and a circuit breaker. A front cover 3 of the main body 1,
The extraction roller 4 is attached to the circuit breaker body 1 via the mounting member 5, and the extraction rail 6 is attached to the fixed frame 4 and slidably supports the circuit breaker body 1 by the extraction roller 4. It is configured.

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 body, and has extractor levers 13 at both ends.
13' is installed. An extraction lever roller 14 is attached to the extraction lever 13 and is fitted into an extraction lever guide groove 16 of a guide member 15 attached to the fixed frame 2.

The extraction operation of the circuit breaker main body 1 will generally be described 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 second
If the operation handle (not shown) is inserted from the extraction operation hole 11 into the disconnection position shown in Fig. C, connected to the worm shaft 10 and rotated, the worm wheel shaft 7 will be connected to the worm shaft 7 via the worm 9 and the worm wheel 8. is rotated, and extraction lever rollers 14 attached to extraction levers at both ends of the worm wheel shaft 7 are rotated.
Since the lever slides and presses the extraction lever guide groove 16, the extraction operation of the circuit breaker main 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 engages 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 integrally connected to the worm 9 is attached to the front. It extends to correspond to the extraction operation hole 11 of the 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 shows the unlocked state. Figure 6 is a partial side sectional view showing a state in which the worm wheel shaft has rotated a little and the lock pin is riding on the outer periphery of the lock cam.
4 to 6, the lock cam 20 is mounted integrally with the worm wheel shaft 7 on the outside of a pair of support frame members 17 that sandwich the worm wheel 8. The lock cam 20 has positioning grooves 20a and 2 on its periphery for locking at each of the connection, test, and disconnection positions.
0b and 20c are provided. lock lever 2
1 is a parallel arm 21a as shown in FIGS. 7 and 10,
21b, and is integrally connected to the arm 21b by a connecting portion 21c at the distal end of the arm 21a, and the lock lever 21 is rotatably supported by a pair of support frame members 17 via a shaft 22, and the arm 21a A lock pin 23 is attached to the other end, and the lock pin 23 fits into each positioning groove 20 of the lock cam 20.
a, 20b, 20c are engaged with each operating position of the circuit breaker main body 1. The stopper pin 24 is a U-shaped support member 2 attached to the support frame member 25.
The worm shaft 6 is slidably passed through the worm shaft 10 so that the lower end corresponds to the worm shaft 10, and the upper end is connected to the lock lever 2.
It is connected to a stopper operating plate 27 that engages with the connecting portion 21c of No. 1. The stopper spring 28 is installed between the stopper pin 24 and the support member 26, and the stopper pin 24 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.

A stopper pin 24 is provided on the outer periphery of the worm shaft 10.
An engagement recess 30 is provided every 1/4 rotation in correspondence with
The stopper pin 24 is provided so as to engage with any of the engagement recesses 30 of the worm shaft 10 at the time when the lock pin 23 engages with each positioning groove of the lock cam 20.

In FIG. 4, the positioning groove 20a of the lock cam 20 is
Since the lock pin 23 of the lock lever 21 is engaged with the lock pin 23 of the lock lever 21, the stopper pin 24 is engaged with 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 connecting portion 21c of the lock lever 21 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 recess 30 of the worm shaft 10 from the stopper pin 24. The lock pin 23 is rotated by slightly rotating the lock cam 20.
FIG. 5 shows a state in which the lock cam 20 is riding on the outer peripheral edge of the lock cam 20. Further, by rotating the worm shaft 10, the positioning groove 20b of the lock cam 20 and the lock pin 23 are automatically engaged, and then the stopper pin 24 is moved to the worm shaft 10.
It engages with the engagement recess 30 of and stops at the test position. 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 in which the positioning lock release lever automatically returns from the release position to the lock position; 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. A positioning lock release lever spring 34 is exposed at the front to form an operating handle, and is provided so that the tip of the second arm 31b corresponds to the engager 33 provided at the tip of the arm 21b of the lock lever 21. It is installed between the lock release lever 31 and the lock lever arm 21b, and always biases the positioning lock release lever 31 clockwise. foot lever 35
is rotatably supported at the center by the worm wheel shaft 7, and has an engaging groove 35a at one end and a hook portion 3 at the other end.
5b, and the engaging groove 35a 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, for example, in order to detect the opening/closing position. 35b is provided so as to be able to engage and release the tail end of the shutter lever 37. This shutter lever 37 has a shutter plate 12 at one end that opens and closes the extraction operation hole 11.
The first arm 37a equipped with the
The other end of the second arm 37c is rotatably supported by a shaft 38 in correspondence with the hook portion 35b of the hook lever 35. Connecting plate 3
9 connects the second arm 37c of the shutter lever 37 and the arm 21a of the lock lever 21;
Connected to the lock lever 21a by a pin 40,
The long groove 39a of the connecting plate 37 and the shutter lever 37c
and are loosely connected by a pin 41. The trip shaft 42 of the tripping mechanism collapses the opening/closing mechanism of the circuit breaker to open the circuit by rotation.A trip piece 43 is attached to the trip shaft 42, and the trip piece 43 is attached to an engaging protrusion 44 provided on the shutter lever 37. It is set up correspondingly.

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 stopper pin 24 shown in FIG. 4 is disengaged from the engagement recess 30 of the worm shaft 10.
In addition, by rotating the lock lever 21, the connecting plate 39
Shutter plate 1 that presses down shutter lever 37 through the shaft and rotates shutter lever 37 clockwise about shaft 38 to close extraction operation hole 11.
2 opens, the protruding piece 4 of the shutter lever 37 opens.
Step 4 rotates the trip piece 44 counterclockwise so that the circuit breaker cannot be closed, and the operating handle is connected to the worm shaft 10 from the extraction operation hole 11 to reach the state shown in FIG. 8 in which extraction operation can be performed.

Therefore, when the lock cam 20 is rotated by operating the worm shaft 10, its outer periphery slightly pushes the lock pin 23 of the lock lever 21, and as the lock lever 21 rotates clockwise, the positioning lock release lever 31 and the lock lever are rotated. The lever spring 3 disengages from the engaging element 33 and releases the positioning lock.
4, the positioning lock release lever 31 automatically returns to the position shown by the two-dot chain line in FIG.
When the circuit breaker is in the closed position, the hook portion 35b of the lever 35 is engaged with one end of the shutter lever 37, as shown in FIG. The rotation of the lock lever 21 is controlled by the connecting plate 39.
The release operation is not possible because it is blocked by the pin 41 of the shutter lever 37 via the shutter lever 37.

Effects of the invention As described above, the positioning locking mechanism of the extraction type circuit breaker of this invention has a locking cam 20 integrally attached to the worm wheel shaft 7 at each operating position.
It is stopped and held at each operating position by the engagement between the positioning groove of the worm shaft 10 and the lock pin 23 of the lock lever 21, and the engagement between the engagement recess 30 of the worm shaft 10 and the stopper pin 24.

Therefore, in the engaged state at each operating position, the operating force exerted by the operator to further rotate the operating handle is directly blocked by the engagement between the engagement recess 30 of the worm shaft 10 and the stopper pin 24, and at the same time. The cam 2 locks the rotation of the worm wheel shaft 7.
0 and the lock pin 23, it does not lock the operation force amplified by the worm 9 and the worm wheel 8, but locks the operator's direct operation force. Therefore, a locking member having a small strength can sufficiently provide a locking effect at each operating position.

[Brief explanation of the drawing]

1 to 11 show an embodiment of the positioning locking mechanism of the extraction type circuit breaker of this invention, and FIG. 1 is a simplified front view of the extraction type circuit breaker implementing this invention. Figure 2A is a disconnection position, Figure 2B is a test position, Figure 2C is a simplified side view showing the extraction operation at the test position, Figure 3 is a partial side view showing the relationship between the worm and the worm wheel, and Figures 4 to 4. Figure 6 shows the positioning locking mechanism of the circuit breaker main body in this invention, Figure 4 is a partial side sectional view showing the locked state in the connected position, and Figure 5 shows the state when the lock is released. 6 is a sectional view taken along line A-A in FIG. 4 in the direction of the arrow; FIGS. 7 to 11 are related explanatory views showing the positioning lock release device; FIG. Figure 8 is a side view showing the positioning lock release lever in the locked position, Figure 8 is a side view showing the positioning lock release lever in the release position, Figure 9 is the positioning lock release lever in the release position. 10 is a partial plan view of FIG. 7, and FIG. 11 is a partial bottom view of FIG. 7. In the diagram, 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, 12: 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, 20c: Positioning groove, 21: Lock lever, 21a, 21b: Arm,
22: Shaft, 23: Lock pin, 24: Stopper pin, 25, 26: Support member, 27: Operation plate, 2
8: Stopper spring, 29: Lock lever spring,
30: Engagement recess, 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: Connection plate, 4
0,41: Pin, 42: Tripshaft, 4
3: Trip piece, 44: Engagement protrusion piece.

Claims (1)

[Claim for Utility Model Registration] Extraction in which the circuit breaker body is extracted and inserted into each operation position of connection, test, and disconnection by connecting the operating handle to the worm shaft and driving the worm wheel shaft through the worm. a lock cam attached to the worm wheel shaft and having a positioning groove on its periphery; a lock lever rotatably supported and having a lock pin on one side releasably engaged with the positioning groove; A stopper pin provided to interlock with the lock lever and biased toward the worm shaft by a stopper spring; and a plurality of engagement recesses provided around the worm shaft so as to be releasably engageable with the stopper pin; A positioning and locking mechanism for an extraction type circuit breaker, characterized in that the stopper pin and the engagement recess of the worm shaft engage with each other at each operating position where the positioning groove of the lock cam and the lock pin of the lock lever engage.