JPH0529215U - Position locking mechanism of draw-out circuit breaker - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a highly reliable position lock mechanism for a draw-out circuit breaker that can reduce the number of parts and simplify the structure and stabilize the automatic lock. [Configuration] Lock plate 16 is lock plate spring 1
In the unlocked state in which it is pushed against 7, the main screw 7 can be rotated by the pull-out handle to move the circuit breaker 2. Then, when the indicator 18 moves through the indicator cam 19 by the connecting pin 23 moved by the insert screw 6 in accordance with the movement of the circuit breaker 2 to reach the test position and the connection position, the screw lock 12 that is separated from the lock plate 16 is released. Is moved in the pull-out direction by the screw lock spring 13 and engages with the pin 11 of the main screw 7, whereby the rotation of the main screw 7 is blocked and automatically locked.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a position locking mechanism of a drawer type circuit breaker, which is composed of a drawer frame and a circuit breaker that can be drawn into and inserted into the drawer frame so as to be inserted freely, and that locks the withdrawal and insertion operations of the circuit breaker. is there.

[0002]

[Prior Art]

 A conventional position lock mechanism for a draw-out type circuit breaker, for example, as disclosed in Japanese Utility Model Laid-Open No. 60-135011, has a circuit breaker at a predetermined disconnection position, test position and connection position when the circuit breaker is pulled out and inserted. When they are positioned, the pull-out and insertion operations are automatically locked to clarify their positions.

[0003]

[Problems to be solved by the device]

 The conventional position lock mechanism of the draw-out type circuit breaker has a problem that not only the structure is complicated due to the large number of parts but also the stability of the automatic lock is lacking.

The present invention has been made in order to solve such a problem, and provides a highly reliable position lock mechanism for a draw-out circuit breaker which can reduce the number of parts to simplify the structure and stabilize the automatic lock. The purpose is to get.

[0005]

[Means for Solving the Problems]

 A position lock mechanism of a drawer type circuit breaker according to the present invention includes an insert screw provided on a draw-out frame, a rotary screw inserted into the breaker so as to rotate at a fixed position, and rotated by a draw-out handle to be screwed with the insert screw. Main screw, a screw lock rotatably inserted through the main screw and held so as to move along the axial direction of the main screw, and a screw lock supported so as to move along the main screw. And a lock plate that is biased in the pull-out direction, a connecting pin that is held so as to move along the axial direction of the main screw and that is moved by the insert screw when the circuit breaker moves, and a protrusion of the lock plate. Along the inside surface of the indicator cover that has holes and this indicator cover An indicator which is provided so as to transition and has an opening for projecting the lock plate and which is set at each position by an indicator cam, and when the indicator shifts to a test position or a connection position, the lock plate Is not engaged with the respective edges of the projecting hole and the projecting opening, but is projected by the lock plate spring and automatically shifts to the locked position.

[0006]

[Action]

 In this invention, in the unlocked state in which the lock plate is pushed against the lock plate spring and engages with the protruding hole of the indicator cover or each edge of the protruding opening of the indicator, the lock plate causes the screw lock to move into the screw lock spring. Since the screw lock does not engage with the pin of the main screw by moving in the insertion direction, the main screw can be rotated by the pull-out handle to move the circuit breaker. Then, when the indicator moves through the indicator cam by the connecting pin that is moved by the insert screw as the circuit breaker moves to the test position or the connecting position, the lock plate is pushed out of the indicator cover or the indicator cover. Since it is projected by the lock plate spring without engaging with the projecting opening, the screw lock that separates from this lock plate moves in the pulling direction by the screw lock spring and engages with the pin of the main screw, preventing rotation of the main screw. , Locked automatically.

[0007]

【Example】

 An embodiment of this invention will be described with reference to FIGS. 1 is a schematic side view showing the draw-out circuit breaker in a disconnection state, and FIG. 2 is a schematic side view showing the draw-out circuit breaker in a connection state. In the figure, 1 is a draw-out frame, 2 is a circuit breaker that is drawn into and inserted in the draw-out frame 1 so that it can be inserted freely. 3 is a draw-out frame side conductor installed in the draw-out frame 1 and 4 is provided in a draw-out frame side conductor 3. Junction 5 is a circuit breaker-side conductor protruding from circuit breaker 2, 6 is an insert screw (female screw member) protruding from draw-out frame 1, and 7 is inserted into circuit breaker 2 so as to rotate at a fixed position. It is the main screw (male member).

FIG. 3 is a cross-sectional plan view showing the position locking mechanism of the drawer type circuit breaker of FIG. 1 in an unlocked state, FIG. 4 is a vertical cross-sectional side view of FIG. 3, and FIG. 5 is a cross-sectional plan view showing the locked state of FIG. 6, FIG. 6 is a vertical side view of FIG. 5, FIG. 7 is a view showing the relationship between the main screw and the screw lock of FIG. 3, FIG. 8 is a view showing a lock plate, FIG. 9 is a view showing an indicator cover, and FIG. FIG. 11 is a plan view of a main part showing a state of a test position, FIG. 11 is a plan view of a main part showing a state of a connection position, FIG. 12 is a plan view of a main part showing an intermediate position between a test position and a connection position, and FIG. 13 is an indicator. 14 is a vertical sectional side view of FIG. 13 (a), and FIG. 15 is a vertical sectional side view of FIG. 13 (b).

In the figure, 8 is a frame of the circuit breaker 2, 9 is a mechanism frame fixed to the frame 8, and 10 is a flange portion formed in an intermediate portion of the main screw 7. The forward movement of the screw 7 is restricted. Reference numeral 11 denotes a pin which is an intermediate portion of the main screw 7 and projects rearward of the flange portion 10. The pin 11 engages the crosspiece 9a of the mechanism frame 9 to restrict the reverse movement of the main screw 7. A screw lock 12 is inserted into the mechanism frame 9 so as to move in the front-rear direction, and has a hole 12a through which the main screw 7 rotatably passes, in the center. 13 is a screw lock spring that holds the screw lock 12 between the flange 10 and the pin 11 in a biased state, and 14 is a recess provided on the rear surface of the screw lock 12, which has a positional relationship with which the pin 11 engages. ing . Reference numeral 15 is an indicator cover fixed to the mechanism frame 9, and has a round hole 15a for inserting a drawer handle (not shown), a projection hole 15b for projecting a lock plate, which will be described later, and each display hole 15c. There is. A lock plate 16 is provided on the mechanism frame 9 so as to move in the front-rear direction. One end 16a of the lock plate is biased by a lock plate spring 17 in a direction of protruding from the protruding hole 15b of the indicator cover 15, and the lock When the one end 16a is pushed in against the plate spring 17, the screw lock 12 is moved forward against the screw lock spring 13 by the other end 16b in the unlocked state in the disconnection state of FIG. 13 (a) and FIG. The step portion 16c is engaged with the inner peripheral edge of the protruding hole 15b. Reference numeral 18 is an indicator that slides along the mechanism frame 9 inside the indicator cover 15, and has an opening 18a through which the lock plate 16 projects and a drawer handle is inserted, and an indication 18b of each position. There is. A cam surface 18A for guiding the lock plate 16 is formed in the opening 18a. An indicator cam 19 is rotatably supported on the mechanism frame 9 by a pin 20 and has a cam groove 19a. Reference numeral 21 is an interlocking plate rotatably supported by the pin 20, and is engaged with the indicator 18 by the pin 21a. Reference numeral 22 is a pulling spring, which integrates the indicator cam 19 and the interlocking plate 21. 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 It has a positional relationship of hitting the tip of.

Next, the operation will be described. In the disconnection 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 23b of the connecting pin 23 contacts the insert screw 6 as shown in FIG. The connection pin 23, the indicator cam 19, the interlocking plate 21, and the indicator 18 do not operate without contact, and the disconnection display 18b at the upper stage of the indicator 18 is in a state of being visible from the upper display hole 15c of the indicator cover 15. In this disconnection state, the step 16c of the lock plate 16 is pushed by the lock plate spring 17 and engaged with the edge of the projecting hole 15b as shown in FIGS. 3, the other end 16b of the lock plate 16 advances the screw lock 12 against the screw lock spring 13 as shown by the solid line in FIGS. Is becoming

When the one end 16a of the lock plate 16 is lifted from this unlocked state (in the direction of arrow 24 in FIG. 14), the lock plate 16 is pushed by the lock plate spring 17 to project, and is imagined in FIGS. 5 and 7. As shown by the line, the screw lock 12 released from the other end 16b of the lock plate 16 is pressed by the screw lock spring 13 and the pin 11 engages with the recess 14. Therefore, the pin 11 is inserted from the round hole 15a of the indicator cover 15. The main handle 7 cannot be rotated by the pull-out handle, and it is locked.

When the main screw 7 is rotated clockwise by the pull-out handle from the unlocked disconnection state shown in FIGS. 1, 3, 13 (a) and 14, the main screw 7 is screwed into the insert screw 6. By doing so, the circuit breaker 2 is inserted. The other end 23b of the connecting pin 23 hits the insert screw 6 on the way to push the connecting pin 23, the indicator cam 19 and the interlocking plate 21 are rotated counterclockwise, and the indicator 18 moves. The test state shown in (c) is reached. From the disconnection position of FIG. 13 (a) to the test position of FIG. 13 (c), as shown in FIGS. 13 (b) and 15, the step portion 16c of the lock plate 16 continues to the edge of the projecting hole 15b. The lock plate 16 is held in the unlocked state because the lock plate 16 is engaged with the edges of the openings 18a of the indicators 18, respectively. However, during that time, the lock plate 16 is gradually lifted by the cam surface 18A of the indicator 18 as shown in FIG. 13B, and the upper and lower step portions 16c of the lock plate 16 are projected into the projecting hole at the test position of FIG. 13C. 15b and the edges of the opening 18a are disengaged, that is, when the indicator 18 reaches the test position of FIG. 13C, the lock plate 16 is projected by the lock plate spring 17 and is automatically locked. In this test state, the middle test display 18b of the indicator 18 is in a state of being exposed from the middle display hole 15c of the indicator cover 15.

When the main screw 7 is rotated clockwise by the pull-out handle from the test state in which the one end 16a of the lock plate 16 is pushed in to release the lock, the main screw 7 is screwed into the insert screw 6 and the circuit breaker 2 is opened. It is inserted further. Then, the connection state shown in FIGS. 2, 11, and 13 (e) is obtained. In this connection state, the circuit breaker side conductor 5 is connected to the lead frame side conductor 3 via the junction 4.

From the test position of FIG. 13C to the connection position of FIG. 13E, the step portion 16c of the lock plate 16 engages with the edge of the projecting hole 15b as shown in FIG. 13D. Therefore, the lock plate 16 is held in the unlocked state. Then, the lock plate 16 is gradually lifted by the cam surface 18A of the indicator 18, and the step portion 16c of the lock plate 16 does not engage with the edge of the projecting hole 15b at the connecting position shown in FIG. At the connecting position shown in FIG. 13 (e), the lock plate 16 is projected by the lock plate spring 17 and is automatically locked. In this connection state, the lower connection display 18b of the indicator 18 can be seen from the lower display hole 15c of the indicator cover 15.

When the main screw 7 is rotated counterclockwise by the pull-out handle from the connected state where the one end 16a of the lock plate 16 is pushed in and the lock is released, the circuit breaker 2 is pulled out.

[0016]

[Effect of the device]

 As described above, according to the present invention, it is possible to reduce the number of parts and simplify the structure, and at the same time, it is possible to obtain high reliability that stabilizes the automatic lock.

[Brief description of drawings]

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

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

3 is a cross-sectional plan view showing an unlocked state of the position locking mechanism of FIG. 1. FIG.

4 is a vertical side view of FIG.

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

6 is a vertical sectional side view of FIG.

FIG. 7 is a diagram showing the relationship between the main screw and the screw lock of FIG.

FIG. 8 is a diagram showing a lock plate.

FIG. 9 is a diagram showing an indicator cover.

FIG. 10 is a main-portion plan view showing a state of a test position.

FIG. 11 is a main part plan view showing a state of a connection position.

12 is a plan view of relevant parts showing an intermediate position between the test position shown in FIG. 10 and the connection position shown in FIG. 11.

FIG. 13 is a front view showing the operation of the indicator.

FIG. 14 is a vertical sectional side view of FIG.

FIG. 15 is a vertical sectional side view of FIG.

[Explanation of symbols]

 1 Drawer Frame 2 Circuit Breaker 3 Drawer 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 15 Indicator Cover 15b Projection Hole 16 Lock Plate 16a Lock Plate One End 16b Lock Plate Other end 17 Lock plate spring 18 Indicator 18a Opening 19 Indicator cam 23 Connecting pin 23a One end of connecting pin 23b Other end of connecting pin

Claims (1)

[Scope of utility model registration request] 1. A draw-out frame, a circuit breaker that can be drawn into and inserted into the draw-out frame, a circuit breaker-side conductor protruding from the circuit breaker, and a circuit breaker side provided in the draw-out frame. In a drawer type circuit breaker having a conductor connected to a drawing frame side through a junction, an insert screw provided in the drawing frame, inserted into the circuit breaker so as to rotate at a fixed position, and drawn from the outside. A main screw rotated by a handle and screwed into the insert screw, and a screw lock rotatably inserted through the main screw and 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 the drawer direction by a lock plate spring, At the 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, and At the lock position where one end largely protrudes from the side surface of the drawer frame, the other end separates from the screw lock, whereby the screw lock moves in the drawing 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, and one end of which engages with the indicator cam and the other end of which extends near the tip of the main screw for testing. Between the position before the position and the connection position Connector pin that is brought into contact with the insert screw and is moved by the insert screw when the circuit breaker moves, an indicator cover that is attached to a side surface of the drawer frame and has a protruding hole of the lock plate, and an inner surface of the indicator cover. An indicator having a protruding opening for the lock plate and set at each position by the indicator cam, the lock being provided when the indicator moves to a test position or a connection position. A position locking mechanism for a drawer type circuit breaker, wherein the plate is adapted to be projected by the lock plate spring and to be automatically moved to the locking position without engaging with the respective edges of the projecting hole and the projecting opening.