Pull-out circuit breaker

Abstract

The interlocking mechanism of the pull-out type circuit breaker comprises a handle locking pin (63) and an interlocking rod (62). The handle locking pin (63) prevents the pull-out handle from being inserted into the pull-out mechanism part (50). The interlocking rod (62) rotates the handle locking pin (63) in conjunction with the operation of the open circuit button to enable the pull-out handle to be inserted into the pull-out mechanism part (50). The interlocking rod (62) comprises an extension part (62a) and a bending part (62b). The extension part (62a) extends toward an operating part (63c) in the handle locking pin (63) that abuts against the interlocking rod (62). The bending part (62b) bends from the extension part (62a) toward the extension direction of the rotation axis (63d) of the handle locking pin (63) and abuts against the operating part (63c).

Description

Technical Field

[0001] The present invention relates to a draw-out type circuit breaker that can be drawn out and housed in a draw-out frame for a circuit breaker body. Background Art

[0002] Conventionally, a draw-out type circuit breaker having a draw-out frame and a circuit breaker body is known. The circuit breaker body is connected to the draw-out frame via a draw-out rail and can be drawn out from the draw-out frame. In this draw-out type circuit breaker, the circuit breaker body is drawn out from the draw-out frame by inserting a draw-out handle into a draw-out mechanism portion and rotating the draw-out handle.

[0003] Patent Document 1 discloses a draw-out type circuit breaker configured such that the circuit breaker body cannot be drawn out of the draw-out frame when the circuit is in a closed state. In this draw-out type circuit breaker, an interlock mechanism is provided. The interlock mechanism prevents the insertion of the draw-out handle into the draw-out mechanism portion when the circuit is in a closed state, and allows the insertion of the draw-out handle into the draw-out mechanism portion when an open circuit button for setting the circuit to an open state is operated.

[0004] In the interlock mechanism described in Patent Document 1, when the circuit is in a closed state, the insertion of the draw-out handle into the circuit breaker body is prevented by a handle locking pin. In this interlock mechanism, in response to the operation of the open circuit button for setting the circuit to an open state, the interlock lever moves while abutting against the handle locking pin. Thereby, the operating portion of the handle locking pin slides on the end portion of the interlock lever and the handle locking pin rotates, and the draw-out handle can be inserted into the circuit breaker body.

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2003-308764

[0006] However, in the conventional interlock mechanism, when the handle locking pin is supported so as to be movable in the rotation axis direction, if the handle locking pin moves in the rotation axis direction, the contact area of the interlock lever with the handle locking pin becomes insufficient, and the operation of the interlock mechanism may become unstable. Summary of the Invention

[0007] The present invention has been made in view of the above circumstances, and an object thereof is to obtain a draw-out type circuit breaker capable of improving the stability of the operation of the interlock mechanism.

[0008] In order to solve the above-mentioned problems and achieve the purpose, the pull-out type circuit breaker of the present invention has a pull-out frame, a circuit breaker body, a pull-out mechanism and an interlocking mechanism. The circuit breaker body is connected to the pull-out frame via a pull-out track and can be pulled out from the pull-out frame. The pull-out mechanism is inserted into the pull-out handle from the outside, and the circuit breaker body moves in the pull-out direction of pulling the circuit breaker body out of the pull-out frame and the insertion direction of inserting the circuit breaker body into the pull-out frame along with the movement of the pull-out handle. The interlocking mechanism limits the insertion of the pull-out handle into the pull-out mechanism. The interlocking mechanism has a handle locking pin and an interlocking rod. The handle locking pin prevents the insertion of the pull-out handle into the pull-out mechanism by abutting against the pull-out handle. The interlocking rod rotates the handle locking pin in conjunction with the operation of the open circuit button so that the pull-out handle can be inserted into the pull-out mechanism. The interlocking rod has an extension portion and a bending portion. The extension portion extends toward the operating portion of the handle locking pin that abuts against the interlocking rod. The bent portion is bent from the extending portion toward the rotation axis direction of the handle lock pin and abuts against the operating portion.

[0009] Effects of the Invention

[0010] According to the present invention, there is an effect that the stability of the operation of the interlocking mechanism can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a perspective view of the external appearance of the pull-out type circuit breaker according to the first embodiment.

[0012] Figure 2 This is a perspective view of the external appearance of the pull-out type circuit breaker showing a state in which the circuit breaker body according to the first embodiment is pulled out from the pull-out frame.

[0013] Figure 3 This is a perspective view of the external appearance of the pull-out type circuit breaker according to the first embodiment in a state where the circuit breaker body is pulled out from the pull-out frame and the mold cover is removed.

[0014] Figure 4 It is a cross-sectional view of the circuit breaker body when the pull-out type circuit breaker according to the first embodiment is in the tripped state.

[0015] Figure 5 It is a cross-sectional view of the circuit breaker body when the pull-out type circuit breaker according to the first embodiment is in the open circuit state after charging.

[0016] Figure 6 It is a cross-sectional view of the circuit breaker body when the pull-out type circuit breaker according to the first embodiment is in the closed state.

[0017] Figure 7 This is a front view showing an example of the internal structure of the circuit breaker body according to the first embodiment.

[0018] Figure 8It is a diagram showing the relationship among the main shaft, the arm for the insulating link, and the insulating link according to Embodiment 1.

[0019] Figure 9 It is a diagram showing an example of the structure of the pull-out handle according to Embodiment 1.

[0020] Figure 10 It is along Figure 1 The sectional view taken along the X-X line shown.

[0021] Figure 11 It is a diagram showing the relationship between the handle locking pin and the pull-out handle when the open button of the circuit breaker main body according to Embodiment 1 is not pressed.

[0022] Figure 12 It is a diagram showing the situation where the circuit breaker main body is pulled out from the pull-out frame by the pull-out handle when the open button of the circuit breaker main body according to Embodiment 1 is pressed.

[0023] Figure 13 It is a side view showing an example of a part of the internal structure of the circuit breaker main body according to Embodiment 1.

[0024] Figure 14 It is a front view showing an example of a part of the internal structure of the circuit breaker main body when the open button of the circuit breaker main body according to Embodiment 1 is not pressed.

[0025] Figure 15 It is a front view showing an example of a part of the internal structure of the circuit breaker main body when the open button of the circuit breaker main body according to Embodiment 1 is pressed.

[0026] Figure 16 It is Figure 14 The enlarged front view of a part of.

[0027] Figure 17 It is Figure 13 The enlarged side view of a part of.

[0028] Figure 18 It is Figure 15 The enlarged view of the area of the reference numeral D shown.

[0029] Figure 19 It is Figure 14 The enlarged view of the area of the reference numeral C shown. Detailed implementation mode

[0030] Next, the pull-out type circuit breaker according to the embodiment will be described in detail based on the drawings.

[0031] Embodiment 1.

[0032] Figure 1 This is a perspective view of the appearance of the draw-out circuit breaker according to Embodiment 1. Figure 2 This is a perspective view of the appearance of the draw-out circuit breaker showing the state where the circuit breaker main body according to Embodiment 1 is drawn out from within the draw-out frame. Figure 3 This is a perspective view of the appearance of the draw-out circuit breaker in the state where the circuit breaker main body according to Embodiment 1 is drawn out from the draw-out frame and the molded cover is removed. In addition, Figures 1 to 3 a state where a part of the draw-out frame of the draw-out circuit breaker is cut away is shown.

[0033] As Figures 1 to 3 shown, the draw-out circuit breaker 100 according to Embodiment 1 has: a circuit breaker main body 1 that opens and closes the circuit of a three-phase circuit; a terminal device 2 that is connected to the circuit breaker main body 1; and a draw-out frame 3 that houses the circuit breaker main body 1 and in which the terminal device 2 is disposed. And, as Figure 2 and Figure 3 shown, the draw-out circuit breaker 100 has a telescopic draw-out rail 4 that connects the circuit breaker main body 1 and the draw-out frame 3 in such a manner that the circuit breaker main body 1 can be drawn out from within the draw-out frame 3. In addition, the draw-out circuit breaker 100 can, for example, retractably house the circuit breaker main body 1 within the frame body of an unillustrated enclosed switchboard.

[0034] In addition, as Figure 1 and Figure 2 shown, the draw-out circuit breaker 100 has a draw-out mechanism unit 50 into which an unillustrated draw-out handle is inserted from the outside, and the circuit breaker main body 1 is moved in the draw-out direction of drawing the circuit breaker main body 1 out of the draw-out frame 3 and in the insertion direction of inserting the circuit breaker main body 1 into the draw-out frame 3 as the draw-out handle is moved.

[0035] In addition, in a plurality of drawings including Figures 1 to 3 , for ease of understanding of the description, a three-dimensional orthogonal coordinate system including the Z-axis, X-axis, and Y-axis is shown, with the positive direction of the Z-axis being vertically upward, the positive direction of the X-axis being the direction of drawing the circuit breaker main body 1 out of the draw-out frame 3, and the Y-axis being perpendicular to the X-axis and Z-axis respectively. Hereinafter, the positive direction of the Z-axis may sometimes be referred to as the upward direction, and the negative direction of the Z-axis may sometimes be referred to as the downward direction. In addition, the positive direction of the X-axis may sometimes be referred to as the front direction, and the negative direction of the X-axis may sometimes be referred to as the rear direction. In addition, the positive direction of the Y-axis may sometimes be referred to as the right direction, and the negative direction of the Y-axis may sometimes be referred to as the left direction.

[0036] The circuit breaker main body 1, as Figure 1 and Figure 2As shown, there is a housing 10 with insulation properties. The housing 10 has a molded case 11 and a molded cover 12. On the front surface 12a of the molded cover 12, there are arranged: a handle 13 for manually storing energy in a closing spring 18 described later; a closing button 14 for setting the circuit of a three-phase circuit to a closed state; and an open button 15 for setting the circuit of the three-phase circuit to an open state.

[0037] In addition, as shown in Figure 3 the circuit breaker main body 1 has a switching mechanism section 5 that is housed in the housing 10 and switches the circuit. Hereinafter, the case where the circuit is in a closed state by the circuit breaker main body 1 may be simply referred to as the closed state, and the case where the circuit is in an open state by the circuit breaker main body 1 may be simply referred to as the open state. In addition, the operation from the open state to the closed state performed by the circuit breaker main body 1 may be referred to as the closing operation.

[0038] Figure 4 is a cross-sectional view of the circuit breaker main body when the draw-out type circuit breaker according to Embodiment 1 is in the tripped state. Figure 5 is a cross-sectional view of the circuit breaker main body when the draw-out type circuit breaker according to Embodiment 1 is in the fully charged open state. Figure 6 is a cross-sectional view of the circuit breaker main body when the draw-out type circuit breaker according to Embodiment 1 is in the closed state. Figure 7 is a front view showing an example of the internal structure of the circuit breaker main body according to Embodiment 1. In addition, hereinafter, clockwise and counterclockwise refer to clockwise and counterclockwise on the attached drawing including Figures 4 to 6 .

[0039] As shown in Figure 4 the circuit breaker main body 1 has a load-side fixed conductor 42, a movable contact member 43 provided with a movable contact 43a, and a power-source-side fixed conductor 44 provided with a fixed contact 44a. In addition, the circuit breaker main body 1 has: a flexible conductor 45 that has flexibility, one end of which is fixed to the load-side fixed conductor 42 and the other end of which is fixed to the movable contact member 43; and a crimping spring 46, one end of which is attached to the housing 10 and the other end of which is attached to the flexible conductor 45. The movable contact 43a and the fixed contact 44a are in contact with each other, whereby the load-side fixed conductor 42 and the power-source-side fixed conductor 44 are electrically connected via the flexible conductor 45. The movable contact member 43 provided with the movable contact 43a is driven by the switching mechanism section 5. In addition, the movable contact member 43 may also be a structure including the flexible conductor 45.

[0040] The opening and closing mechanism unit 5 includes: a frame 16 fixed to the housing 10; a camshaft 21 rotatably supported by the frame 16; and a charging cam 22 and a ratchet 23, each fixed to the camshaft 21. Fixed shafts 24a, 26a, 30a, etc. are fixed to the frame 16. When the ratchet 23 is operated in the direction indicated by the arrow E shown in Figure 4 , it rotates counterclockwise in linkage with the rotation of the handle 13.

[0041] In addition, the opening and closing mechanism unit 5 includes: a guide plate 17, one end of which is fixed to the frame 16 and extends upward; a closing spring 18 mounted on the guide plate 17; and an L-shaped charging arm 24, the middle part of which is rotatably supported by the fixed shaft 24a. A spring hook pin 24d provided at one end of the charging arm 24 is inserted into a long hole 17a formed in the guide plate 17. One end of the closing spring 18 abuts against the spring hook pin 24d, and the other end abuts against the frame 16. In addition, an arm-side roller 24b provided at the other end of the charging arm 24 abuts against the cam surface 22b of the charging cam 22. A cam-side roller 22a is provided between the charging cam 22 and the ratchet 23.

[0042] In addition, the opening and closing mechanism unit 5 includes: a first closing spring key 25 rotatably supported by the fixed shaft 24a; a second closing spring key 26 rotatably supported by the fixed shaft 26a; and a closing rod 27, a part of which is formed in a semi-cylindrical shape. The front end of the first closing spring key 25 abuts against the cam-side roller 22a. A spring-key-side roller 25a provided in the middle part between the base end and the front end of the first closing spring key 25 abuts against the lower end of the second closing spring key 26. A protrusion 26b and a engaging portion 26c are formed at the lower end of the second closing spring key 26.

[0043] The second closing spring key 26 is subjected to a counterclockwise force by a return spring (not shown), so the protrusion 26b attempts to rotate the first closing spring key 25 clockwise. In the Figure 4 shown state, the first closing spring key 25 is in a state of abutting against the cam-side roller 22a, and the cam-side roller 22a serves as a stopper and the first closing spring key 25 is held in a non-rotatable state. In addition, the closing rod 27 rotates clockwise by a manual operation by the closing button 14 shown in Figure 7 or an energization operation by a solenoid or the like.

[0044] Figure 8 FIG. is a diagram showing the relationship between the main shaft, the arm for the insulating link, and the insulating link according to Embodiment 1, and only shows a part of the structure of the opening and closing mechanism unit 5. As shown in Figure 8As shown, the opening / closing mechanism unit 5 includes: a main shaft 28; an insulating link arm 28a fixed to the main shaft 28; and a second link arm 28b fixed to the main shaft 28 and disposed between the insulating link arms 28a. Three insulating link arms 28a are arranged at equal intervals at the proximal end of the main shaft 28 along the extending direction. The insulating link arms 28a and the second link arm 28b have the same shape. The insulating link arm 28a is rotatably connected to Figure 4 one end of the insulating link 41 shown. The other end of the insulating link 41 is connected to the movable contact 43.

[0045] As Figure 4 shown, the opening / closing mechanism unit 5 includes: a closing toggle link mechanism 29; a link lever 30 rotatably supported by a fixed shaft 30a; a tripping spring key 31 rotatably supported by a fixed shaft 26a; and a tripping lever 32 engaged with one end of the tripping spring key 31. The closing toggle link mechanism 29 includes a first link 29a, a second link 29b, and pins 29c, 29d. One end of the first link 29a and one end of the second link 29b are connected by a pin 29d. The other end of the second link 29b is connected to the other end of the second link arm 28b by a pin 29c. One end of the link lever 30 is connected to the other end of the first link 29a by a pin 30b, and a lever-side roller 30c is provided at an intermediate portion between one end and the rotation center. The side surface of the tripping spring key 31 is engaged with the lever-side roller 30c.

[0046] Next, an energy storage operation for converting the circuit breaker main body 1 from Figure 4 the tripped state shown to Figure 5 the open state with energy storage completed shown will be described. Energy storage means the energy storage of the closing spring 18. In the tripped state shown when the closing spring 18 is released, if the handle 13 is pressed in the direction shown by the arrow E by manual operation, the ratchet 23, the camshaft 21, and the charging cam 22 rotate counterclockwise. Accordingly, the arm-side roller 24b moves while rotating along the cam surface 22b, and the charging arm 24 rotates clockwise about the fixed shaft 24a. Thus, as Figure 4 shown, the spring hook pin 24d provided at one end of the charging arm 24 moves downward to store energy in the closing spring 18. Figure 5 shown, when the charging cam 22 rotates counterclockwise, the first closing spring key 25 rotates clockwise, and the key-side roller 25a disengages from the protruding portion 26b of the second closing spring key 26. Accordingly, the lower end of the second closing spring key 26 becomes free, and thus it rotates counterclockwise by a return spring (not shown), and the engaging portion 26c engages with the key-side roller 25a of the first closing spring key 25 to stop the counterclockwise rotation. In addition, the closing lever 27 rotates counterclockwise by a return spring (not shown) to become

[0047] Also, if the charging cam 22 rotates counterclockwise, the first closing spring key 25 rotates clockwise, and the key-side roller 25a disengages from the protruding portion 26b of the second closing spring key 26. As a result, the lower end of the second closing spring key 26 becomes free, so it rotates counterclockwise by a return spring (not shown), and the engaging portion 26c engages with the key-side roller 25a of the first closing spring key 25 to stop the counterclockwise rotation. In addition, the closing lever 27 rotates counterclockwise by a return spring (not shown) to becomeFigure 5 The state shown prevents the clockwise rotation of the second closing key 26.

[0048] In addition, as the charging arm 24 rotates clockwise, the working surface 24c moves downward. Therefore, due to the bending force of the closing toggle mechanism 29, the link-side roller 29e of the closing toggle mechanism 29 follows the downward movement of the working surface 24c. As a result, the first link 29a of the closing toggle mechanism 29 moves downward, and the pin 30b moves downward. Consequently, the link lever 30 rotates counterclockwise, and the lever-side roller 30c also rotates counterclockwise. Thereby, the tripping key 31 rotates clockwise by the return spring, as Figure 5 shown, the lever-side roller 30c engages with the concave portion of the tripping key 31, and the tripping lever 32 rotates clockwise by a return spring (not shown). In Figure 5 the state shown, the tripping lever 32 acts as a stopper to prevent the counterclockwise rotation of the tripping key 31.

[0049] Furthermore, the charging cam 22 rotates approximately one full turn through multiple pressing operations of the handle 13 and finally reaches the state as Figure 5 shown. In Figure 5 the state shown, the spring hook pin 24d is pressed upward by the release force of the closing spring 18. Therefore, a counterclockwise force is applied to the charging arm 24, but the closing rod 27 acts as a stopper via the first closing key 25 and the second closing key 26. Thus, the counterclockwise rotation of the charging arm 24 is prevented.

[0050] In Figure 5 the state shown, if the closing button 14 as Figure 7 shown is pressed, the closing rod 27 rotates clockwise, and the locking of the second closing key 26 by the closing rod 27 is released. After the locking is released, the second closing key 26 rotates clockwise, and the engagement between the engaging portion 26c and the key-side roller 25a is disengaged. Therefore, the charging cam 22 rotates counterclockwise while rotating the first closing key 25 counterclockwise via the cam-side roller 22a. As a result, the arm-side roller 24b falls into the stepped portion of the cam surface 22b of the charging cam 22.

[0051] The charging arm 24 rotates counterclockwise by the release force of the closing spring 18, and the working surface 24c pushes up the link-side roller 29e of the closing toggle mechanism 29. The tripping key 31 is locked from moving counterclockwise by the tripping lever 32. Therefore, the closing toggle mechanism 29 extends, causing the second link arm 28b to rotate counterclockwise. Thereby, as Figure 6 shown, in the circuit breaker body 1, the movable contact 43a contacts the fixed contact 44a, and the circuit becomes closed. In addition, in Figure 6In the state of , a clockwise rotational force is imparted to the link lever 30 through the crimping spring 46 via the closing elbow link mechanism 29 and the pin 30b. Therefore, the trip key 31 is pressed counterclockwise via the lever side roller 30c, but the counterclockwise rotation of the trip key 31 is blocked by the trip lever 32, so the clockwise rotation of the link lever 30 is blocked.

[0052] When the circuit breaker main body 1 is Figure 6 in the state shown, if the open button 15 shown in Figure 7 is pressed, the trip lever 32 rotates counterclockwise, and the trip key 31 rotates counterclockwise by the clockwise rotational force of the link lever 30. Therefore, the lever side roller 30c disengages from the concave portion of the trip key 31, and the link lever 30 rotates clockwise. As a result, the pin 30b at the other end of the closing elbow link mechanism 29 moves upward and the closing elbow link mechanism 29 bends. At this time, the link side roller 29e of the closing elbow link mechanism 29 moves leftward along the working surface 24c of the charging arm 24, and the pin 29c drives the insulating link 41 leftward to move the movable contact 43 leftward. Therefore, the movable contact 43a separates from the fixed contact 44a, and the circuit breaker main body 1 returns to Figure 4 the open state shown.

[0053] In the draw-out type circuit breaker 100, as Figure 7 shown, an interlock mechanism 60 is provided. The interlock mechanism 60 prevents a draw-out handle (not shown) from being inserted into the draw-out mechanism portion 50 when the circuit is in a closed state. Hereinafter, the structures of the draw-out handle, the draw-out mechanism portion 50, and the interlock mechanism 60 will be specifically described.

[0054] First, the structure of the draw-out handle will be described. Figure 9 is a diagram showing an example of the structure of the draw-out handle according to Embodiment 1. As Figure 9 shown, the draw-out handle 70 according to Embodiment 1 is formed in a T shape and has a shaft portion 71 and a handle 72. The shaft portion 71 is formed in a cylindrical shape and has: an extension portion 71a, one end portion of which is connected to the central portion of the handle 72; and a front end portion 71b, which is continuous with the other end portion of the extension portion 71a and is formed in a hexagonal shape.

[0055] Next, the structure of the draw-out mechanism portion 50 will be described. Figure 10 is a cross-sectional view along the Figure 1 X-X line shown. As Figure 10 shown, the draw-out mechanism portion 50 has a front surface panel 51, a support portion 52, a main screw 53, a compression spring 54, and an insertion screw 55. The front surface panel 51, the support portion 52, and the main screw 53 are provided on the circuit breaker main body 1, and the insertion screw 55 is provided on the draw-out frame 3.

[0056] The front panel 51 has a circular opening 51a through which the shaft 71 of the pull-out handle 70 is inserted into the pull-out mechanism 50. The support 52 supports the main screw 53 so that it can move in the front-rear direction. The support 52 is also called an indicator frame.

[0057] The main screw 53 includes: a barrel 53a, which is formed with a snap-fitting portion 53a1; a screw 53b, which is formed with an external threaded portion 53b1; and a ring 53c, which is movably mounted on the outer periphery of the screw 53b. The snap-fitting portion 53a1 is a hole formed in a hexagonal shape, into which the front end portion 71b of the pull-out handle 70 is inserted and snap-fitted with the front end portion 71b. A compression spring 54 is arranged between the barrel 53a and the ring 53c, and the movement of the ring 53c in the rearward direction is restricted. Therefore, when the barrel 53a is pressed in the rearward direction, the barrel 53a is urged in the forward direction by the compression spring 54.

[0058] The insert screw 55 is formed with a screw hole 55 a , and the external thread portion 53 b 1 of the main screw 53 is inserted into the screw hole 55 a to engage with the main screw 53 .

[0059] exist Figure 10 FIG. 6 shows a portion of the interlock mechanism 60. The interlock mechanism 60 restricts the insertion of the pull-out handle 70 into the pull-out mechanism portion 50. The interlock mechanism 60 includes: a handle lock pin 63, which is rotatably supported by the support portion 52; and an interlock lever 62, which is rotatably supported by the user. Figure 7 The handle lock pin 63 is rotated in conjunction with the operation of the open button 15 shown, thereby releasing the insertion prevention of the pull-out handle 70 into the pull-out mechanism portion 50 .

[0060] Figure 11 It is a diagram showing the relationship between the handle lock pin and the pull-out handle when the open button of the circuit breaker body according to the first embodiment is not pressed. Figure 12 This is a diagram showing a state in which the circuit breaker body is pulled out from the pull-out frame by the pull-out handle when the circuit breaker body's open button is pressed according to the first embodiment.

[0061] exist Figure 7 When the open button 15 shown in FIG. 1 is not pressed, and the operator attempts to insert the front end 71b of the shaft portion 71 in the pull-out handle 70 into the engaging portion 53a1 of the barrel portion 53a in the main screw 53, the handle locking pin 63 is located at a position abutting against the front end 71b of the pull-out handle 70. Figure 11 As shown, the insertion of the front end portion 71b of the pull-out handle 70 into the engaging portion 53a1 is blocked.

[0062] exist Figure 7When the open circuit button 15 shown is pressed, the handle locking pin 63 is in a position where it does not contact the shaft portion 71 of the pull-out handle 70. Therefore, as shown Figure 12 within the frame A of Figure 12 , the operator can insert the front end portion 71b of the shaft portion 71 of the pull-out handle 70 into the engaging portion 53a1 of the main screw 53.

[0063] Moreover, the operator rotates the handle 72 of the pull-out handle 70 about the shaft portion 71, thereby continuously rotating the main screw 53, and thus can release the engagement between the external thread portion 53b1 and the insertion screw 55. After the engagement between the external thread portion 53b1 and the insertion screw 55 is released, as shown Figure 12 within the frame B of Figure 12 , the operator can pull out the circuit breaker body 1 from the pull-out frame 3 by moving the pull-out handle 70 in the forward direction.

[0064] In addition, when the operator houses the circuit breaker body 1 in the pull-out frame 3, after inserting the front end portion 71b of the pull-out handle 70 into the engaging portion 53a1 of the main screw 53, the operator moves the pull-out handle 70 in the backward direction and inserts it into the external thread portion 53b1 and the insertion screw 55. Then, the operator rotates the handle 72 of the pull-out handle 70 about the shaft portion 71, thereby rotating the main screw 53 and engaging the external thread portion 53b1 and the insertion screw 55, and thus can house the circuit breaker body 1 in the pull-out frame 3.

[0065] Next, the interlock mechanism 60 will be described. Figure 13 is a side view showing an example of a part of the internal structure of the circuit breaker body according to Embodiment 1. Figure 14 is a front view showing an example of a part of the internal structure of the circuit breaker body in a state where the open circuit button of the circuit breaker body according to Embodiment 1 is not pressed. Figure 15 is a front view showing an example of a part of the internal structure of the circuit breaker body in a state where the open circuit button of the circuit breaker body according to Embodiment 1 is pressed.

[0066] As shown Figure 13 in Figure 13 , the interlock mechanism 60 according to Embodiment 1 includes a closing arm 61, an interlock lever 62, and a handle locking pin 63. The closing arm 61 is rotatably supported by the frame 16 via a rotating shaft 64. The closing arm 61 rotates counterclockwise about the rotating shaft 64 when the open circuit button 15 is pressed backward. The interlock lever 62 extends in the vertical direction, one end is rotatably connected to the closing arm 61, and the other end abuts against the handle locking pin 63. The interlock lever 62 moves upward as the closing arm 61 rotates counterclockwise. Figure 13 in Figure 13 .

[0067] As shown Figure 14As shown, the interlocking lever 62 has an extension portion 62a and a bent portion 62b. The handle locking pin 63 has a locking portion 63a, a rotating portion 63b, and an operating portion 63c. The extension portion 62a of the interlocking lever 62 extends downward from the base end connected to the closing arm 61 in the direction toward the operating portion 63c of the handle locking pin 63. The bent portion 62b of the interlocking lever 62 bends from the extension portion 62a in the extending direction of the rotation axis 63d of the handle locking pin 63, that is, in the left - right direction, and abuts against the operating portion 63c. The bent portion 62b is formed by, for example, bending processing. Hereinafter, the extending direction of the rotation axis 63d is sometimes referred to as the rotation axis direction. In Figure 14 In the example shown, the bent portion 62b is configured to bend leftward, but it may also bend rightward.

[0068] The locking portion 63a is formed in a cylindrical shape, and the rotating portion 63b is inserted and penetrated therein. The rotating portion 63b is formed in a U - shape at the central portion where it is inserted and penetrated inside the locking portion 63a, and one end and the other end are rotatably supported by the support portion 52. In addition, a handle locking spring 65 is provided between the other end of the rotating portion 63b and the support portion 52, and the locking portion 63a is urged around the rotation axis 63d by this handle locking spring 65.

[0069] In addition, the operating portion 63c is formed in an L - shape and is continuous with the rotating portion 63b. The operating portion 63c extends in a direction orthogonal to the rotation axis 63d and then bends in the direction along the rotation axis 63d. In order to make the handle locking pin 63 rotate easily, a gap is provided between the support portion 52 that supports the rotating portion 63b and the operating portion 63c. In addition, the locking portion 63a and the rotating portion 63b may also be of an integrated structure. In addition, the handle locking pin 63 may be configured such that instead of providing the locking portion 63a, the rotating portion 63b also serves as the locking portion.

[0070] In Figure 13 and Figure 14 In the state shown, the locking portion 63a of the handle locking pin 63 exists in front of the engaging portion 53a1 of the main screw 53. Therefore, in the draw - out type circuit breaker 100, in the state where the open - circuit button 15 in the circuit breaker body 1 is not pressed, it is possible to prevent the front end portion 71b of the draw - out handle 70 from being erroneously inserted into the engaging portion 53a1 of the main screw 53.

[0071] In Figure 13 and Figure 14 In the state shown, if the open - circuit button 15 is pressed backward, the open - circuit button 15 abuts against the closing arm 61. If the open - circuit button 15 is further pressed, the closing arm 61 rotates counter - clockwise about the rotation axis 64 in Figure 13 ...

[0072] If the closing arm 61 is in Figure 13When rotating counterclockwise, the interlocking lever 62 moves in the direction indicated by the label F in Figure 13 , that is, upward. If the interlocking lever 62 moves upward, the handle locking pin 63 rotates about the rotation axis 63d by the applied force of the handle locking spring 65. Thus, as Figure 15 shows, the locking portion 63a of the handle locking pin 63 moves downward, so that the locking portion 63a does not exist in front of the engaging portion 53a1 of the main screw 53. Therefore, in the Figure 15 shown state, the front end portion 71b of the pull-out handle 70 can be inserted into the engaging portion 53a1 of the main screw 53.

[0073] The interlocking lever 62 is biased downward by a return spring (not shown) in the direction opposite to the direction indicated by the label F in Figure 13 . If the operator releases the open circuit button 15 from the Figure 15 shown state, the interlocking lever 62 moves downward. If the interlocking lever 62 moves downward, the operating portion 63c of the handle locking pin 63 is pressed downward by the bent portion 62b of the interlocking lever 62. Therefore, the operating portion 63c of the handle locking pin 63 slides on the bent portion 62b of the interlocking lever 62, and as Figure 14 shows, the locking portion 63a of the handle locking pin 63 moves in the front direction of the engaging portion 53a1 of the main screw 53.

[0074] Figure 16 is a front view showing an enlarged part of Figure 14 . Figure 17 is a side view showing an enlarged part of Figure 13 . As Figure 16 and Figure 17 show, the operating portion 63c of the handle locking pin 63 has: a first extension portion 63c1, which is continuous with one end of the rotating portion 63b and extends in a direction orthogonal to the rotation axis 63d; and a second extension portion 63c2, which is continuous with the first extension portion 63c1 and extends in a direction along the rotation axis 63d. The second extension portion 63c2 is pressed by the interlocking lever 62, whereby the first extension portion 63c1 rotates about the rotation axis 63d, becoming the Figure 16 and Figure 17 shown state.

[0075] The surface of the bent portion 62b of the interlocking lever 62 that contacts the second extension portion 63c2 is a flat surface. Therefore, the contact of the interlocking lever 62 with the second extension portion 63c2 is performed by surface contact by the bent portion 62b of the interlocking lever 62. As Figure 16As shown, in the left - right direction, the length of the bent portion 62b is longer than the length of the extending portion 62a. Therefore, compared with the case where the extending portion 62a abuts against the second extending portion 63c2 without providing the bent portion 62b, the interlocking lever 62 can increase the abutting amount against the second extending portion 63c2, that is, the abutting area against the second extending portion 63c2. Thus, for example, even when the handle locking pin 63 moves in the left - right direction by the amount of the gap between the operating portion 63c and the supporting portion 52, the state where the bent portion 62b abuts against the second extending portion 63c2 is maintained. Therefore, in the draw - out type circuit breaker 100, the stability of the operation of the interlocking mechanism 60 can be improved.

[0076] Here, consider the case where the bent portion 62b is not provided on the interlocking lever 62. In this case, the end face of the extending portion 62a of the interlocking lever 62 abuts against the operating portion 63c, but the end face of the extending portion 62a of the interlocking lever 62 is a fracture surface. If the operating portion 63c of the handle locking pin 63 slides on the fracture surface of the interlocking lever 62, due to the fluctuation of the sliding friction, it is possible that the sliding operation of the handle locking pin 63 relative to the interlocking lever 62 becomes unstable, and the reset operation of the interlocking lever 62 becomes unstable. The reset operation of the interlocking lever 62 is the operation in which the interlocking lever 62 moves upward after the operator releases the open - circuit button 15. The reset operation of the interlocking lever 62 can be made stable by increasing the load of a reset spring (not shown) that applies force to the interlocking lever 62, but it cannot be greater than the load for operating the closing button 14. On the other hand, in the draw - out type circuit breaker 100, the abutment of the interlocking lever 62 against the second extending portion 63c2 is performed by surface contact implemented by the bent portion 62b of the interlocking lever 62, so that the sliding operation of the handle locking pin 63 relative to the interlocking lever 62 can be made stable.

[0077] The contact position of the bent portion 62b against the second extending portion 63c2 changes with the up - and - down movement of the interlocking lever 62. That is, with the up - and - down movement of the interlocking lever 62, the second extending portion 63c2 slides on the bent portion 62b. In the interlocking mechanism 60, as described above, the abutting area of the interlocking lever 62 against the second extending portion 63c2 increases, so that the sliding of the second extending portion 63c2 relative to the bent portion 62b can be stabilized. Therefore, in the draw - out type circuit breaker 100, the stability of the operation of the interlocking mechanism 60 can be improved.

[0078] For example, assume that the interlocking mechanism 60 is in Figure 16in the state shown, the extension portion 62a directly abuts against the second extension portion 63c2. In this case, if the closing arm 61 moves in the left direction, the contact area of the extension portion 62a with the second extension portion 63c2 decreases, and it may not be possible to stably rotate the handle locking pin 63 implemented by the closing arm 61. On the other hand, in the circuit breaker main body 1, even if the handle locking pin 63 moves in the left direction, the state where the bent portion 62b abuts against the second extension portion 63c2 is maintained. Therefore, in the draw-out type circuit breaker 100, the stability of the operation of the interlocking mechanism 60 can be improved.

[0079] In addition, in the interlocking mechanism 60, when the closing arm 61 moves in the downward direction, the bent portion 62b moves in the left direction, which is the direction of separating from the support portion 52. Thus, in the circuit breaker main body 1, even if the closing arm 61 moves in the left direction, the state where the bent portion 62b abuts against the second extension portion 63c2 is more stably maintained. Therefore, in the draw-out type circuit breaker 100, the stability of the operation of the interlocking mechanism 60 can be further improved.

[0080] Figure 18 is Figure 15 an enlarged view of the region of the reference numeral D shown. Figure 19 is Figure 14 an enlarged view of the region of the reference numeral C shown. As Figure 18 shown, a convex portion 62a1 protruding in the right direction, which is the direction toward the frame 16, is formed on the extension portion 62a of the interlocking lever 62. The convex portion 62a1 is formed by forging the extension portion 62a, for example. The convex portion 62a1 is disposed in the groove portion 16a1 formed in the frame 16 in a state where the open circuit button 15 is pressed. The groove portion 16a1 is a concave-shaped region in the opposing surface 16a of the frame 16 with respect to the extension portion 62a of the interlocking lever 62, and is located farther from the extension portion 62a than the flat portion 16a2. In addition, the groove portion 16a1 has an inclined surface that is closer to the flat portion 16a2 in the left-right direction as it goes downward, and the convex portion 62a1 slides on this inclined surface.

[0081] From Figure 18 the state shown, when the operator releases the hand from the open circuit button 15, the interlocking lever 62 moves in the opposite direction to the direction shown by the reference numeral F in Figure 13 , so the convex portion 62a1 moves out of the groove portion 16a1, as Figure 19It is shown in the position where the flat portion 16a2 of the frame 16 abuts. That is, the convex portion 62a1 protrudes toward the opposite surface 16a of the frame 16. Therefore, when changing from the position where the handle locking pin 63 does not prevent the handle 70 from being pulled out and inserted into the pulling mechanism portion 50 to the position where the handle locking pin 63 prevents the handle 70 from being pulled out and inserted into the pulling mechanism portion 50, it moves from the position inside the groove portion 16a1 to the position abutting against the flat portion 16a2. Therefore, the bent portion 62b moves Figure 19 in the left direction in. As a result, in the circuit breaker main body 1, even if the closing arm 61 moves in the left direction, the state where the bent portion 62b abuts against the second extension portion 63c2 can be more stably maintained. Therefore, in the draw-out type circuit breaker 100, the stability of the operation of the interlocking mechanism 60 can be further improved.

[0082] In addition, as Figure 17 shown, the contact surface of the bent portion 62b with the operation portion 63c has an inclination angle θ1 with respect to the front-rear direction, which is a direction orthogonal to both the moving direction of the interlocking lever 62 and the rotation axis direction of the handle locking pin 63. That is, the contact surface of the bent portion 62b with the operation portion 63c is more inclined upward as it goes toward the rear direction. As a result, compared with the case where the interlocking mechanism 60 does not have the inclination angle θ1 with the bent portion 62b, the position in the front-rear direction where the second extension portion 63c2 contacts the bent portion 62b is suppressed from changing sharply when the interlocking lever 62 moves downward. Therefore, in the draw-out type circuit breaker 100, the stability of the operation of the interlocking mechanism 60 can be further improved.

[0083] As described above, the pull-out type circuit breaker 100 according to the first embodiment includes: the pull-out frame 3; the circuit breaker body 1, which is connected to the pull-out frame 3 via the pull-out rail 4 and can be pulled out from the pull-out frame 3; the pull-out mechanism 50; and the interlock mechanism 60. The pull-out mechanism 50 is inserted into the pull-out handle 70 from the outside, and the circuit breaker body 1 is moved in the pull-out direction of pulling the circuit breaker body 1 out of the pull-out frame 3 and the insertion direction of inserting the circuit breaker body 1 into the pull-out frame 3 as the pull-out handle 70 moves. The interlock mechanism 60 restricts the insertion of the pull-out handle 70 into the pull-out mechanism 50. The interlock mechanism 60 includes a handle locking pin 63 and an interlocking lever 62. The handle locking pin 63 prevents the insertion of the pull-out handle 70 into the pull-out mechanism 50. The interlocking lever 62 rotates the handle locking pin 63 in conjunction with the operation of the open button 15 by the user, so that the pull-out handle 70 can be inserted into the pull-out mechanism 50. The interlocking rod 62 includes an extension portion 62a and a bent portion 62b. The extension portion 62a extends toward the operating portion 63c of the handle locking pin 63 that abuts against the interlocking rod 62. The bent portion 62b bends from the extension portion 62a toward the rotation axis direction of the handle locking pin 63 and abuts against the operating portion 63c. Thus, in the pull-out type circuit breaker 100, the abutment of the interlocking rod 62 against the second extension portion 63c2 is performed by surface contact performed by the bent portion 62b of the interlocking rod 62. Therefore, the interlocking rod 62 can increase the abutment area against the second extension portion 63c2 compared to the case where the bent portion 62b is not provided and the extension portion 62a abuts against the second extension portion 63c2. Thus, in the pull-out type circuit breaker 100, the stability of the operation of the interlocking mechanism 60 can be improved. In the pull-out type circuit breaker 100, since the operating portion 63c of the interlocking lever 62 abuts against the interlocking lever 62 through surface contact with the operating portion 63c of the interlocking lever 62, the sliding motion of the handle lock pin 63 relative to the interlocking lever 62 can be stabilized.

[0084] In addition, the pull-out type circuit breaker 100 includes a frame 16, and the frame 16 has a groove 16a1 and a flat portion 16a2 formed on the opposite surface 16a of the interlocking rod 62. The extension portion 62a has a convex portion 62a1. The convex portion 62a1 protrudes toward the opposite surface 16a of the frame 16, and when the handle locking pin 63 changes from a position that does not restrict the insertion of the pull-out handle 70 into the pull-out mechanism portion 50 to a position that restricts it, it moves from a position in the groove 16a1 to a position that abuts against the flat portion 16a2. As a result, in the circuit breaker body 1, even if the closing arm 61 moves in the rotation axis direction, the state in which the bent portion 62b abuts against the second extension portion 63c2 is maintained more stably. Therefore, in the pull-out type circuit breaker 100, the stability of the operation of the interlocking mechanism 60 can be further improved.

[0085] In addition, the bent portion 62b in the draw-out circuit breaker 100 is formed by inclining the surface that abuts against the operation portion 63c in a front-rear direction, which is orthogonal to the moving direction of the interlock lever 62 and the rotational axis direction of the handle locking pin 63, respectively. Thus, the interlock mechanism 60 suppresses a sharp change in the position where the second extension portion 63c2 contacts the bent portion 62b when the interlock lever 62 moves downward. Therefore, in the draw-out circuit breaker 100, the stability of the operation of the interlock mechanism 60 can be further improved.

[0086] The structures shown in the above embodiments represent an example, and can also be combined with other known technologies. Without departing from the gist, a part of the structure can also be omitted or changed.

[0087] Explanation of reference numerals

[0088] 1 Circuit breaker main body, 2 Terminal device, 3 Draw-out frame, 4 Draw-out rail, 5 Opening and closing mechanism portion, 10 Frame, 11 Molded housing, 12 Molded cover, 12a Front surface, 13 Handle, 14 Closing button, 15 Open circuit button, 16 Frame, 16a Opposite surface, 16a1 Groove portion, 16a2 Flat portion, 17 Guide plate, 17a Long hole, 18 Closing spring, 21 Camshaft, 22 Charging cam, 22a Cam side roller, 22b Cam surface, 23 Ratchet, 24 Charging arm, 24a, 26a, 30a Fixed shaft, 24b Arm side roller, 24c Working surface, 24d Spring hook pin, 25 First closing detent, 25a Detent side roller, 26 Second closing detent, 26b Protrusion, 26c, 53a1 Engaging portion, 27 Closing rod, 28 Spindle, 28a Arm for insulating link, 28b Arm for second link, 29 Closing toggle link mechanism, 29a First link, 29b Second link, 29c, 29d, 30b, 47 Pin, 29e Link side roller, 30 Link lever, 30c Lever side roller, 31 Tripping detent, 32 Tripping rod, 41 Insulating link, 42 Load side fixed conductor, 43 Movable contact, 43a Movable contact point, 44 Power source side fixed conductor, 44a Fixed contact point, 45 Flexible conductor, 46 Crimping spring, 50 Draw-out mechanism portion, 51 Front surface panel, 51a Insertion port, 52 Support portion, 53 Main screw, 53a Cylindrical portion, 53b Screw portion, 53b1 External thread portion, 53c Ring portion, 54 Compression spring, 55 Insertion screw, 55a Screw hole, 60 Interlock mechanism, 61 Closing arm, 62 Interlock lever, 62a, 71a Extension portion, 62a1 Protrusion, 62b Bent portion, 63 Handle locking pin, 63a Locking portion, 63b Rotating portion, 63c Operation portion, 63c1 First extension portion, 63c2 Second extension portion, 63d, 64 Rotation axis, 65 Handle locking spring, 70 Draw-out handle, 71 Shaft portion, 71b Front end portion, 72 Handle, 100 Draw-out circuit breaker.

Claims

1. A draw-out circuit breaker, characterized in that, have: Pull out the frame; A circuit breaker body connected to the pull-out frame via a pull-out rail and capable of being pulled out from the pull-out frame; a pull-out mechanism portion into which a pull-out handle is inserted from the outside, and moves the circuit breaker body in a pull-out direction for pulling the circuit breaker body out of the pull-out frame and in an insertion direction for inserting the circuit breaker body into the pull-out frame as the pull-out handle moves; and an interlocking mechanism that limits the insertion of the pull-out handle into the pull-out mechanism portion, The interlocking mechanism has: a handle locking pin that prevents the pull-out handle from being inserted into the pull-out mechanism portion by abutting against the pull-out handle; and an interlocking lever which rotates the handle lock pin in conjunction with the operation of the open button so as to insert the pull-out handle into the pull-out mechanism portion, The interlocking lever has: an extending portion extending toward an operating portion of the handle locking pin that abuts against the interlocking lever; and a bent portion, which is bent from the extending portion toward the rotation axis direction of the handle locking pin and abuts against the operating portion, The curved portion is formed such that a surface that contacts the operating portion is inclined relative to directions orthogonal to the moving direction of the interlocking lever and the rotation axis direction. A frame having a groove portion and a flat portion formed on a surface opposite to the interlocking rod, The extension portion has a convex portion that protrudes toward the opposing surface, and when the handle locking pin is changed from a position that does not restrict the insertion of the pull-out handle into the pull-out mechanism portion to a position that restricts it, the convex portion moves from a position in the groove portion to a position that abuts against the flat portion.

Images