JP2682294B2 - Draw-out circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a drawer frame and a circuit breaker that can be drawn into and inserted into the drawer frame. The circuit breaker moves to establish a disconnection state, a test state and a connection state. It relates to a drawer type circuit breaker.

[0002]

2. Description of the Related Art This type of draw-out circuit breaker has a circuit breaker in a disconnection state, a test state,
It has a lock mechanism that locks in the connected state. For example, it is shown in Japanese Utility Model Laid-Open No. 60-135011. It also has a position display mechanism for displaying each state. However, in the conventional drawer type circuit breaker of this type, the lock mechanism and the position display mechanism are separately configured.

[0003]

In the conventional drawer type circuit breaker, since the lock mechanism and the position display mechanism are separately configured, not only the two mechanisms are difficult to interlock, but the operation becomes unstable, and the configuration is There is a problem in that the number of parts becomes complicated and assembly workability becomes poor, resulting in cost increase.

The present invention has been made in order to solve the above problems, and a lock mechanism and a position display mechanism can be constructed with a simple structure to improve the assembly workability, reduce the cost, and stabilize the operation. The purpose is to obtain a highly reliable drawer type circuit breaker.

[0005]

A drawer type circuit breaker according to the present invention includes an insert screw provided in a drawer frame,
A main screw that is inserted into the circuit breaker so as to rotate at a fixed position and that is rotated by a draw-out handle and that is screwed into the insert screw, and the main screw is rotatably inserted through and in the axial direction of the main screw. A screw lock that is held so as to move along, a lock plate that is supported so as to move along the main screw and is biased in the drawing direction, and that moves along the axial direction of the main screw. It is provided with a connecting pin that is held and moved by the insert screw as the circuit breaker moves, and an indicator that is set at each position via an indicator cam with which the connecting pin engages.

[0006]

In the present invention, when the lock plate is pushed in against the lock plate spring, the screw lock moves in the inserting direction against the screw lock spring by the lock plate and the screw lock engages with the pin of the main screw. Since it does not, the main screw can be rotated by the pull-out handle, and the circuit breaker can be moved to each position. Further, when the lock plate is projected by the lock plate spring, the screw lock separated from the lock plate moves in the pull-out direction by the screw lock spring and engages with the pin of the main screw, so that the main screw is locked without rotating. Further, since the indicator moves via the indicator cam by the connecting pin moved by the insert screw with the movement of the circuit breaker, the indicator is set at each position and each position is displayed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic side view showing the draw-out circuit breaker in a disconnected state, and FIG. 2 is a schematic side view showing the draw-out circuit breaker in a connected state. In the drawing, reference numeral 1 denotes a drawer frame, 2 denotes a circuit breaker which is pulled out and inserted into the drawer frame 1, 3 denotes a drawer frame-side conductor provided on the drawer frame 1, and 4 denotes a junction provided on the drawer frame-side conductor 3. Reference numeral 5 denotes a circuit breaker-side conductor protruding from the circuit breaker 2, 6 denotes an insert screw (female screw member) protruding from the drawer frame 1, and 7 is inserted into the circuit breaker 2 so as to rotate at a fixed position. It is a main screw (male screw member).

FIG. 3 is a cross-sectional plan view showing a draw-out mechanism of the draw-out circuit breaker of FIG. 1, FIG. 4 is a longitudinal sectional side view of FIG. 3, and FIG. 5 is a cross-sectional plan view showing a locked state of the draw-out mechanism of FIG. 6 is a longitudinal sectional side view of FIG. 5, FIG. 7 is a view showing a relationship between a main screw and a screw lock of the pull-out mechanism of FIG. 3, FIG. 8 is a view showing a lock plate, FIG. 9 is a view showing an indicator cover,
FIG. 10 is a diagram showing an engagement state (the state of FIG. 4) between the lock plate and the indicator cover.

In the figure, reference numeral 8 denotes a frame of the circuit breaker 2, 9
Is a pull-out mechanism frame fixed to the frame 8, and 10 is a flange formed at an intermediate portion of the main screw 7, which engages with the frame 8 to regulate the advance of the main screw 7. 1
Reference numeral 1 denotes an intermediate portion of the main screw 7 and a pin projecting rearward from the flange portion 10, which is engaged with the bar 9 a of the draw-out mechanism frame 9 to regulate the backward movement of the main screw 7. Reference numeral 12 denotes a screw lock inserted into the pull-out mechanism frame 9 so as to move in the front-rear direction. The screw lock 12 has a hole 12a in the center through which the main screw 7 rotatably passes. Reference numeral 13 denotes a screw lock spring that holds the screw lock 12 between the flange 10 and the pin 11 in a biased state, and reference numeral 14 denotes a concave portion provided on the rear surface of the screw lock 12, and has a positional relationship in which the pin 11 is engaged. ing. Reference numeral 15 denotes an indicator cover fixed to the drawer mechanism frame 9 and has a round hole 15a for inserting a drawer handle (not shown), a square hole 15b for projecting a lock plate described later, and each display hole 15c. ing. Reference numeral 16 denotes a lock plate provided on the drawer mechanism frame 9 so as to move in the front-rear direction.
Is urged by a lock plate spring 17 in a direction protruding from the square hole 15b of the indicator cover 15, and in a state where one end 16a is pushed in against the lock plate spring 17, the other end 16b causes the screw lock 1 to move.
The step 16c is engaged with the inner peripheral edge of the square hole 15b while the lever 2 is advanced against the screw lock spring 13.

FIG. 11 is a plan view showing the position display mechanism of the draw-out circuit breaker of FIG. 1, FIG. 12 is the same plan view as FIG. 11 showing the state of connection, and FIG. 13 shows the test state shown in FIG. The same plan view as FIG. 11 showing an intermediate state between the connection state shown in FIG. 12 and FIG. 14 is a diagram showing an indicator. In the figure, reference numeral 18 denotes an indicator inside the indicator cover 15 which slides along the pull-out mechanism frame 9 and has a disconnection state display 18a, a test state display 18b, and a connection state display 18c. 19 is a drawer mechanism frame 9
The indicator cam is rotatably supported by the support shaft 20 and has a cam groove 19a. Reference numeral 21 denotes an interlocking plate rotatably supported by the support shaft 20, and is engaged with the indicator 18 by a pin 21a. Reference numeral 22 is a pulling spring, which is a protrusion 19b of the indicator cam 19 and a pin 21a of the interlocking plate 21.
Both are urged so that and are always engaged. Reference numeral 23 is a connecting pin arranged so as to move in the front-rear direction along the main screw 7. One end 23a is engaged with the cam groove 19a, and the other end 23b is extended to the vicinity of the tip of the main screw 7 to insert screw 6 Has a positional relationship of hitting the tip of.

Next, the operation will be described. In the disconnected state of the draw-out circuit breaker 2 shown in FIG. 1, the main screw 7 starts to mesh with the insert screw 6, so that the other end 23 b of the connecting pin 23 abuts on the insert screw 6 as shown in FIG. 3. Without this, the connection pin 23, the indicator cam 19, the interlocking plate 21, and the indicator 18 do not operate, and the disconnection state display 18a of the indicator 18 can be viewed from the upper display hole 15c of the indicator cover 15.

In this disconnection state, if one end 16a of the lock plate 16 is projected by the lock plate spring 17 as shown in FIGS. 5 and 6, the other lock plate 16 as shown by phantom lines in FIGS. Since the screw lock 12 released from the end 16b is pressed by the screw lock spring 13 and the pin 11 engages with the recess 14, the main screw 7 can be rotated by the pull-out handle inserted from the round hole 15a of the indicator cover 15. Cannot be performed and the locked state is set.

When the one end 16a of the lock plate 16 is pushed in against the lock plate spring 17 from the locked state shown in FIGS. 5 and 6, the step 16c is angled by the force of the lock plate spring 17 as shown in FIG. It is held in a state of being engaged with the inner peripheral edge of the hole 15b. In the state where the lock plate 16 is held in this manner, the other end 16b of the lock plate 16 advances the screw lock 12 against the screw lock spring 13 as shown by a solid line in FIGS. Then, the engagement between the pin 11 and the concave portion 14 is released, and the lock is released.

When the main screw 7 is rotated clockwise by the pull-out handle from the unlocked and disconnected state shown in FIGS. 1, 3 and 4, the main screw 7 is screwed into the insert screw 6 and the circuit breaker 2 is turned on. Is inserted. Connecting pin 2 on insert screw 6 on the way
3 hits the other end 23b and pushes the connecting pin 23,
The indicator cam 19 and the interlocking plate 21 which are integrated by the pulling spring 22 are rotated counterclockwise to move the indicator 1
8 shifts to the test state shown in FIG. In this test state, the test state display 18b of the indicator 18 can be seen from the middle display hole 15c of the indicator cover 15.

In this test state as well, when the one end 16a of the lock plate 16 is protruded by the lock plate spring 17, the lock state is established by the same operation as described above.
That is, it is locked in the test state.

When the main screw 7 is rotated clockwise by the pull-out handle again from the unlocked test state or from the disconnected state, the breaker 2 is screwed into the insert screw 6, whereby the circuit breaker 2 is turned on. It is inserted further. Then, the connection state shown in FIG. 2 is obtained. In this connection state, the breaker-side conductor 5 is connected to the draw-out frame-side conductor 3 via the junction 4.

In the connection state shown in FIG. 2, as shown in FIG. 12, the connecting pin 23 is pushed to the rearmost position, and the indicator cam 19 and the interlocking plate 21 are rotated maximum counterclockwise, and the indicator 18 is shifted. Since the display 18c of the connection state of the indicator 18 is
In a state where it can be seen from the lower display hole 15c.

Also in this connection state, when the one end 16a of the lock plate 16 is projected by the lock plate spring 17, the lock state is established by the same operation as described above.
That is, the connection is locked. When the main screw 7 is rotated counterclockwise by the pull-out handle from the connection state shown in FIG. 2, the circuit breaker 2 is pulled out.

[0019]

As described above, according to the present invention, the lock mechanism and the position display mechanism can be constructed with a simple structure, the assembling workability is improved, the cost is reduced, and the operation is stable and highly reliable. The effect is that you can get things.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a disconnection state according to an embodiment of the present invention.

FIG. 2 is a schematic side view showing a connection state.

FIG. 3 is a cross-sectional plan view showing the drawer mechanism of FIG.

FIG. 4 is a vertical sectional side view of FIG. 3;

FIG. 5 is a cross-sectional plan view showing a locked state of the pull-out mechanism of FIG. 3;

FIG. 6 is a vertical sectional side view of FIG. 5;

FIG. 7 is a diagram showing a relationship between a main screw and a screw lock in FIG. 3;

FIG. 8 is a view showing a lock plate.

FIG. 9 is a view showing an indicator cover.

FIG. 10 is a diagram showing an engagement state between a lock plate and an indicator cover.

FIG. 11 is a plan view showing the position display mechanism of FIG. 1;

FIG. 12 is the same plan view as FIG. 11 showing a state in which a connection state is displayed.

13 is the same plan view as FIG. 11 showing an intermediate state between the test state shown in FIG. 11 and the connection state shown in FIG. 12;

FIG. 14 is a diagram showing an indicator.

[Explanation of symbols]

 1 Drawing Frame 2 Circuit Breaker 3 Drawing Frame Side Conductor 4 Junction 5 Circuit Breaker Side Conductor 6 Insert Screw 7 Main Screw 11 Pin 12 Screw Lock 13 Screw Lock Spring 16 Lock Plate 17 Lock Plate Spring 18 Indicator 19 Indicator Cam 23 Connecting Pin

Claims (1)

(57) [Claims] 1. A drawer frame, a circuit breaker mounted on the drawer frame so as to be able to be pulled out and inserted, a circuit breaker-side conductor protruding from the circuit breaker, and a circuit breaker side provided on the drawer frame. A drawer-type circuit breaker having a drawer frame-side conductor to which a conductor is connected via a junction, an insert screw provided in the drawer frame, inserted into the breaker so as to rotate at a fixed position, and drawn out from the outside. A main screw which is turned by a handle and screwed with the insert screw, a screw lock which is rotatably inserted into the main screw and is held on the drawer frame side so as to move along the axial direction of the main screw; , Supported on the drawer frame side so as to move along the main screw and urged in a drawer direction by a lock plate spring, In a normal position where the end slightly projects from the side surface of the drawer frame, the screw lock does not engage with the pin of the main screw by moving the screw lock at the other end in the insertion direction against the screw lock spring. At a lock position in which one end protrudes greatly from the side surface of the drawer frame, the other end moves away from the screw lock so that the screw lock moves in the pulling-out direction by a screw lock spring and engages with the pin of the main screw to engage the main screw. A lock plate for stopping the rotation of the main screw, which is held on the drawer frame side so as to move along the axial direction of the main screw, one end of which is engaged with the indicator cam, and the other end of which is extended to near the tip of the main screw. From before this position to the connection position Connection pin that is brought into contact with the insert screw and is moved by the insert screw when the circuit breaker is moved, and is provided so as to be moved along the side surface of the drawer frame and is set at each position through the indicator cam. A draw-out type circuit breaker, which is equipped with an indicator.