JP3414613B2 - Draw-out circuit breaker - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawer operating device for a drawer type circuit breaker. 2. Description of the Related Art A relatively large circuit breaker is of a draw-out type in order to eliminate the trouble of removing an external electric wire connected to a power supply or a load from a terminal or removing the circuit breaker itself from a structure during maintenance and inspection. It is often a circuit breaker. The draw-out type circuit breaker is provided with a draw-out frame terminal for connecting an external electric wire to a draw-out frame fixed to a structure. The draw-out type circuit breaker contacts / opens with the draw-out frame terminal by moving inside the draw-out frame to a movable breaker body. It has a main body terminal to be separated, and the circuit breaker main body can be removed from the drawer frame. The circuit breaker body can be fixed at least in the disconnection position and the connection position by moving in the drawer frame. The disconnection position is a position where the draw-out frame terminal and the main body terminal are separated from each other with a relatively large insulation distance, and the connection position is a position where both terminals are in contact with a relatively large contact pressure so that a predetermined current can be passed. is there. [0003] The movement of the draw-out type circuit breaker when the breaker body is inserted from the disconnection position to the connection position generally has the following features. That is, from the disconnection position until the two terminals come into contact, the moving distance is relatively large, corresponding to the above-described insulation distance, but since no contact pressure is generated between the two terminals, the operating force required for the movement is small. Good. On the other hand, from the contact of both terminals to the connection position, a large operating force is required to gradually increase the above-mentioned contact pressure and overcome the reaction force component in the direction opposite to the insertion. However, the moving distance is set to be considerably small because it is necessary to reduce the depth dimension of the entire circuit breaker. A conventional example of a draw-out type circuit breaker is disclosed in
No. 7006 and Japanese Utility Model Laid-Open No. 6-68275. A conventional draw-out type circuit breaker disclosed in Japanese Patent Application Laid-Open No. 3-7006 has a shaft-shaped fixed body formed with a female screw in a drawer frame in the axial direction on the same axis in the moving direction of the breaker body. An axially movable body which is formed in a circuit breaker main body with an external thread in the axial direction so as not to move in the axial direction is rotatably mounted, and the external thread and the internal thread are mutually screwed and connected. When the movable body is rotated to insert the circuit breaker body, the movable body moves from the disconnection position to the connection position by the male screw being screwed into the female screw. However, when the draw-out contactor attached to the circuit breaker body comes into contact with the draw-out frame terminal to generate a contact pressure in this insertion operation, there is a problem that a large operating force is required to rotate the movable body. For this problem,
It is conceivable to reduce the screw leads of the female screw and the male screw, but in this case, the movable body must be rotated more, and there is no contact pressure from the disconnection position where the moving distance is large to the position where the contact pressure is generated. There is another problem that the number of operation rotations of the movable body becomes too large for the moving operation. The conventional draw-out type circuit breaker disclosed in Japanese Utility Model Laid-Open No. 6-68275 has solved such a problem. FIG. 4 is a partially broken side view showing a state where the circuit breaker main body is at a disconnection position. The drawer-type circuit breaker includes a drawer frame 1 having rails 50, 50, and a circuit breaker movable in the left-right direction along the rail 50 via integrated slide plates 51, 52 and hooks 53, 53. And a main body 2. This drawer-type circuit breaker is provided with frame-side contact members 4 and 4 to which input-side and output-side external electric wires are connected at one end to a drawer frame 1 as main circuit conductors. The circuit breaker main body 2 includes a main body side contact member 5 provided vertically symmetrically (only the upper side is shown in FIG. 4) and an upper and lower main body side contact member which is moved left and right by an opening / closing mechanism (not shown). 5 and a movable contact member 6 which contacts in an open and bridge manner. One end of the main body side contact member 5 can obtain the contact pressure of the opening / closing contact portion between the movable contact member 6 and the other end by the action force of the contact pressure spring 7, and the other end thereof is formed by the action force of the contact pressure spring 8. A contact pressure of the draw-out contact portion with the side contact member 4 can be obtained. The draw-out operation mechanism of this draw-out type circuit breaker is as follows.
An operation bolt 54, a slider 55 that moves in the left and right direction, a slider drive lever 56 and a slide plate drive lever 5 that rotate around a shaft 61 so as to cooperate with each other are provided on the drawer frame 1.
7, a retraction lever 58 supported by a shaft 62, an engagement member 9 formed of a cylindrical roller on the breaker body 2, and a slide plate roller 59 supported by the slide plate 52.
And The operation bolt 54 is rotatably mounted so as not to move in the left-right direction by a groove portion 54a formed in a tongue shape. The pulling lever 58 has engaging edges 58a and 58b formed at a portion near the shaft 62, and a pulling lever roller 64 is pivotally supported at a portion far from the shaft 62. [0007] By using this draw-out operation mechanism, the breaker body 2
The operation for inserting the “.” Into the connection position will be described below. In FIG. 4, when the operation bolt 54 is rotated by the operation handle 3 for the insertion operation, the slider 55 slides rightward, and the slider roller 60 pivotally supported by the slider 55 engages with the U-shaped groove of the slider drive lever 56. Then, the slide plate drive lever 57 rotates clockwise together with the slider drive lever 56, and the reverse J-shaped groove 57a presses the slide plate roller 59 provided on the slide plate 51 to move the breaker body 2 in the insertion direction. Immediately before the frame side contact member 4 and the main body side contact member 5 come into contact with each other, the engagement between the slider drive lever 56 and the slider roller 60 is released. At this time, the inverted J-shaped groove 55 of the slider 55
b engages with the retraction lever roller 64 and presses it, and the engagement edge 58a of the retraction lever 58 and the engagement member 9 are engaged. Further, when the insertion operation is performed, the pull-in lever 58 rotates counterclockwise, and the main body side contact member 5 comes into contact with the inclined side 4a of the frame side contact member 4, and the engaging edge 58a engages the engaging member 9
Is larger than the leftward component of the contact pressure of the two contact members, the circuit breaker main body 2 moves in the insertion direction, and the main body side contact member 5 becomes the frame side contact member. When the horizontal portion is reached from the inclined side 4a of FIG. 4, the leftward component of the contact pressure disappears, and the insertion operation is completed when the engaging member 9 moves to a position where it engages with the engaging edge 58b. This position is the connection position shown in FIG. [0008] This conventional draw-out type circuit breaker includes: During the above-mentioned insertion operation or during the insertion operation, the shaft 6
Since the dimension from 1 to the slider roller 60, which is the point of force, and the dimension to the slide plate roller 59, which is the point of action, are almost equal, the contact pressure is not generated at the drawer contact portion, so that a small operating force is required. The circuit breaker main body 2 can be moved at a corresponding speed according to the lead of the screw with a small number of rotation operations 3. 2. During the operation, the reaction force in the left direction of the contact pressure of the pull-out contact portion is large, but the dimension from the shaft 62 to the pull-in lever roller 64 which is the point of force is changed to the engagement edge 58 which is the point of action.
Since it is set sufficiently large compared to the dimension up to a, even if the operating force acting on the retraction lever roller 64 is small, it acts as a large force on the engagement point between the engagement edge 58a and the engagement member 9, and The component force in the right direction (insertion direction) exceeds the leftward reaction force of the contact pressure, and the circuit breaker body 2 can be moved. At this time, the moving distance of the draw-in lever roller 64 is larger than the moving distance of the circuit breaker main body 2 and the number of rotations of the pull-out operation handle 3 is increased. Since the moving distance of the main body 2 is set to be small, the rotational speed of the pull-out operation handle 3 does not increase so much as to cause a problem. 3. That is, even if the pull-out operation handle 3 is rotated at the same speed, it is necessary to largely change the insertion operation force by causing a speed change effect that the insertion speed of the circuit breaker main body can be changed in the first half and the second half of the insertion operation. The effect is that a small operating force is sufficient. In addition, when a force in the pull-out direction acts on the circuit breaker main body 2 at the connection position by, for example, an electromagnetic repulsive force due to a short-circuit current, the engaging member 9 presses the engaging edge 58b to move the pull-in lever 58 counterclockwise. However, since the retracting lever roller 64 is engaged with the reverse J-shaped groove 55b, the retracting lever 58 does not rotate, and the circuit breaker body 2 does not protrude in the extracting direction. That is, a bolt for fixing the circuit breaker body at the connection position is not always necessary. However, this conventional draw-out type circuit breaker is designed to engage the slider roller 60 and the slider drive lever 56 and to drive the slide plate in order to realize the above-mentioned shifting operation. Engagement of lever 57 with slide plate roller 59, slider 55 and retraction lever roller 64
And there is a problem that the structure is complicated, the types of parts are many, the assembly is troublesome, and the cost is high. After the breaker main body 2 is moved in the insertion direction by the slide plate driving lever 57 by the operation in the above-described insertion operation process, the slider roller 60 and the slider driving lever 56 are moved.
When the engagement of the slider 55 and the retracting lever roller 64 after the engagement of the breaker is released, the breaker body temporarily stops moving. Therefore, in order to continuously move the breaker body, the timing of disengagement of the former and the timing of engagement of the latter must be simultaneous, and this requires precise processing and assembly of the components. there were. The present invention has been made to solve such a problem, and has a drawer type capable of continuously and speedily moving the circuit breaker main body with a small force while having few parts and a simple structure. It is an object to provide a circuit breaker. In order to solve the above problems, a drawer-type circuit breaker according to the present invention comprises a drawer frame having a frame-side contact member, and a drawer frame having a frame-side contact member. A circuit breaker main body having a detachable main body side contact member and moving a drawer frame, wherein an engaging portion provided on the circuit breaker main body has a circumferential engaging member and an operating shaft extending in a moving direction of the circuit breaker main body And an operation shaft holding member that restricts the operation shaft from moving in the axial direction on the circuit breaker body and holds the operation shaft rotatably, and is mutually connected by a male screw and a female screw formed in the operation shaft and the axial direction. A connection shaft that moves in the axial direction by rotating the operation shaft; and a drawer frame that is rotatably provided, an engagement edge with an engagement member is formed near the center of rotation, and this engagement is performed from the rotation center. There is a connecting means with the connecting shaft at a position away from the edge And a formed lever. The engagement edge of the lever is a first engagement edge formed such that a tangent to the engagement member is substantially parallel to a direction in which the breaker body is inserted when the operation shaft is rotated to perform an insertion operation. And a second engagement edge formed by the engagement member being engaged with the first engagement edge following engagement with the first engagement edge, and having a tangent to the engagement member inclined in a direction in which the breaker body is inserted. And an engaging edge. With such a configuration, when the operation shaft is rotated to perform the insertion operation, the coupling amount between the operation shaft and the connection shaft increases. Due to the increase in the coupling amount, the breaker body and the lever are attracted, and a rotational force is generated in the lever. The first engagement edge that is engaged at the beginning of the insertion operation, that is, when the circuit breaker body is moved from the disconnection position, is such that the rotational force of the lever acts in a direction substantially orthogonal to the moving direction of the circuit breaker body. Since the lever engages with the engaging means, the circuit breaker main body moves with little rotation of the lever. During this movement, the frame side and the main body side contact member do not come into contact with each other, so that the circuit breaker main body moves largely with a small operation force and with a small number of operation rotations according to the lead of the screw of the operation shaft and the connection shaft. The second engaging edge engaging with the engaging member is provided so that the rotational force of the lever includes a component force in the direction of inserting the breaker body in a later stage of the inserting operation in which both contact members come into contact with each other. Since it is formed, the breaker body moves in the insertion direction. During this movement, a large acting force is required at the engagement point between the engagement member and the second engagement edge, but the dimension from the rotation center of the lever to the coupling portion between the coupling shaft and the lever, which is the point of force, Since the dimension is set to be sufficiently larger than the dimension up to the second engagement edge, which is the point of action, the power point is largely moved with a small operating force in accordance with the dimensional ratio, and the moving point is small but large at the point of action. Acting force can be generated. Embodiments of the present invention will be described below with reference to embodiments. The main circuit conductor of this embodiment is the same as that of the prior art, and the description thereof is omitted. FIG. 1 is a side view showing a main part of this embodiment when the circuit breaker main body 2 is at a disconnection position. The circuit breaker main body 2 has wheels 20 and 20 rotatably mounted.
Rails 21 and 2 attached to drawer frame 1 for guiding
1 can be moved in a pull-out direction (left direction in the figure) and an insertion direction (right direction in the figure). The operating shaft 13 has a large diameter portion 13a and a small diameter portion 13a.
b and the male screw portion 13c. The operating shaft holding member 1 combined with the bottom of the circuit breaker body 2
4, 14 ′ attached thereto, each of which has a U-shaped notch (not shown)
a, 14'a and the bearing of the small diameter portion 13b formed together and the large diameter bearing 1 provided on the operation shaft holding member 14 '.
4'b, the operation shaft 13 is rotatably held. The bent portion 14b of the operation shaft holding member 14 is formed with a hole through which the draw-out operation handle 3 made of a round bar passes. The diameter of this hole and the bearing of the small diameter portion 13b is smaller than the diameter of the large diameter portion 13a. Therefore, the movement of the operation shaft 13 in the left-right direction with respect to the breaker body 2 is restricted. The tip of the pull-out operation handle 3 is formed in a hexagonal column shape, and a hexagonal hole into which the tip is inserted is formed at the left end of the large diameter portion 13a.
The drawer frame 1 is provided with a lever 16 that rotates together with the shaft 15, an engagement groove 16a is formed near the center of rotation, and an elongated hole 16b is formed at a position far away from the center of rotation. The connecting shaft 17 connects the operating shaft 13 and the lever 16, and is connected to the operating shaft 13 by screwing a male screw portion 13c of the operating shaft 13 into a female screw portion 17a formed from one end thereof. At the other end.
It is connected to the lever 16 by a shaft 18 through which b is inserted. Conversely, a male screw may be formed on the connecting shaft 17 and a female screw may be formed on the operation shaft 13. Next, the insertion operation of the drawer will be described. When the breaker body 2 of FIG. 1 is in the disconnection position,
The engagement groove 16a of the lever 16 is at a position where it can be engaged with the engagement member 9. When the pull-out operation handle 3 is attached to the operation shaft 13 and rotated in this state, the coupling amount between the male screw portion 13c and the female screw portion 17a increases, and the operation shaft 13 is connected to the breaker body 2
, The circuit breaker main body 2 is urged in the insertion direction and the lever 16 is rotated clockwise via the connecting shaft 17. The rotation of the lever 16 causes the first engagement edge 1 to rotate.
6c and the engaging member 9 are engaged. Since the tangent line at this engagement point is formed so as to be substantially parallel to the moving direction of the circuit breaker main body 2, the acting force F received by the engaging member 9 is almost only the upper component, and the circuit breaker main body 2 is Since the upward movement is prevented, the lever 16 hardly rotates. Therefore, the breaker main body 2 moves in the insertion direction by a distance equal to the increased amount of the coupling between the male screw portion 13c and the female screw portion 17a. At this time, the engagement member 9 moves along the first engagement edge 16c. This movement is the first half of the insertion operation,
This operation is performed until the frame side contact member 4 and the main body side contact member 5 come into contact with each other. Since there is no contact pressure between the two, a large force is not required. Can operate. If the direction of the tangent is slightly clockwise from horizontal and inclined in the insertion direction of the breaker body 2, the lever 16 is slightly rotated clockwise. When the insertion operation is further continued, the frame side contact member 4 and the main body side contact member 5 come into contact with each other as shown in FIG. 2, and a large contact pressure is generated therebetween. However, at this time, the engagement member 9 has moved to a position where it engages with the second engagement edge 16d, and the dimension from the rotation center of the lever 16 to the elongated hole 16b is L2, and the distance from the rotation center of the lever 16 to the second engagement edge 16d is L2. When the dimension is L1, the acting force F at the engagement point is a magnitude amplified by (L2 / L1) times the operation force at the force point. In this embodiment, since the value of the ratio (L2 / L1) is set to be large, a small operating force is greatly amplified and transmitted to the engaging member 9. The tangent line of the engagement point at this position is inclined in the direction in which the rotational force of the lever 16 inserts the breaker body 2, and the inclination is sufficient for the horizontal component force F _{H in the} insertion direction to move the circuit breaker body 2. The second engaging edge 16d is formed so that the operating force does not make the operation of the pull-out operation handle 3 difficult. When the operating shaft 13 is rotated while the engaging member 9 is engaged with the second engaging edge 16d, the coupling between the operating shaft 13 and the connecting shaft 17 increases. Generally, this increase (L1 /
L2) × (horizontal component in the engagement direction), the circuit breaker main body 2 relatively moves by a distance Ma. With this movement, the connecting shaft 17 moves together with the breaker body 2 by the distance Ma, and the lever 16 is rotated counterclockwise. This direction is a direction in which the circuit breaker main body 2 is urged in a direction opposite to the insertion direction, and is generally pulled out by a distance Mb corresponding to Ma × (L1 / L2) × (horizontal component of the engagement direction). Acts to move in the direction. Therefore, as the circuit breaker body 2 (Ma
-Mb) in the insertion direction. Here, Ma is Mb
Since it is much larger, there is almost no effect of the distance Mb. In this movement process, as the contact point between the frame side contact member 4 and the main body side contact member 5 moves on the inclined side 4a of the frame side contact member 4, the contact pressure gradually increases, and the contact point becomes horizontal with the frame side contact member 4. When it reaches the portion, it becomes the connection position of the breaker body 2. As described above, in the latter half of the insertion operation from the time when the frame side contact member 4 and the main body side contact member 5 come into contact with each other to reach the connection position, the withdrawal operation is performed for the moving distance of the circuit breaker main body 2 as compared with the first half. Although the operating speed of the handle 3 increases, the handle 3 can be operated with a force significantly smaller than the required insertion force of the circuit breaker body 2. At the connection position, as shown in FIG. 3, the engaging member 9 has moved to the engaging edge 16e at the end of the engaging groove 16a. Since the terminal engaging edge 16e is formed such that the urging force acts in the direction of rotating the lever 16 clockwise via the engaging member 9 even when the urging force acts on the pull-out direction at 2, The lever 16 does not rotate counterclockwise through the engagement member 9 to cause the circuit breaker body 2 to protrude in the pull-out direction. In the insertion operation, the optimum conditions of the operating force and the operating speed of the pull-out operating handle 3 are as follows: the diameter of the screw between the operating shaft 13 and the lever 16, the screw lead, the ratio between L1 and L2, the first engagement edge. The engagement angle between the engagement member 16c and the engagement member 9 and the like can be set as parameters. When the circuit breaker body 2 of this embodiment is pulled out from the connection position to the disconnection position, the pull-out operation handle 3 may be rotated in a direction opposite to the insertion operation. By this operation, the lever 16 rotates counterclockwise until the contact between the main body side contact member 5 and the frame side contact member 4 is cancelled.
The engaging member 9 is pressed at the engaging edge 16f facing in parallel with the second engaging edge 16d, and the circuit breaker main body 2 is actuated by the action of reducing the amount of coupling between the operating shaft 13 and the connecting shaft 17.
In the pull-out direction. At the position where the contact between the two members has been eliminated, the engaging member 9 has reached the position where the engaging member 9 engages with the engaging edge 16g facing in parallel with the first engaging edge 16c. The rotation of the main body 2 is stopped only by acting on the main body 2 downward, and the breaker main body 2 moves in the pull-out direction by a distance equal to the decrease in the amount of engagement between the male screw portion 13a and the female screw portion 17a. That is, as in the case of the insertion operation, while the main body side contact member 5 and the frame side contact member 4 are in contact with each other, the amount of movement of the breaker main body 2 is smaller than the number of rotation operations of the drawer operation handle 3, Is eliminated, the amount of movement increases. The present invention is embodied in the form described above, and the circuit breaker main body can be easily formed with a small operation amount and a small operation force until the main body side contact member and the frame side contact member come into contact with each other. It can be moved, and after touching, the operation amount is large for the moving distance, but the operation force is small but the operation force can be inserted with a small operation force against the large contact pressure, and the insertion operation as a whole with a small force The effect is that the speedy operation can be performed without difficulty, the breaker body moves continuously without any discontinuity, and the operation is stable. In addition, such an operation can be realized with a small number of parts, and the cost of parts and assembly can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a main part of an embodiment of the present invention in a state where a circuit breaker main body is in a disconnection position. FIG. 2 is a side view of a main part of the embodiment of the present invention when a main body side contact member comes into contact with a frame side contact member. FIG. 3 is a side view of a main part of the embodiment of the present invention in a state where the circuit breaker main body is at a connection position. FIG. 4 is a side view of a main part of a conventional example in a state where a circuit breaker main body is at a disconnection position. FIG. 5 is a side view of a main part of a conventional example with a circuit breaker main body at a connection position. [Description of Signs] 1 Drawer frame 2 Circuit breaker body 3 Drawer operation handle 4 Frame side contact member 5 Body side contact member 6 Movable contact member 7, 8 Contact pressure spring 9 Engagement member 13 Operation shaft 13a Large diameter portion 13b Small diameter portion 13c Male screw portion 14, 14 'Operation shaft holding member 15 Shaft 16 Lever 16a Engagement groove 16b Long hole 16c First engagement edge 16d Second engagement edge 16e, 16f, 16g Engagement edge 17 Connection shaft 17a Female screw Part 18 axis 20 wheels 21 rail

Claims (1)

(57) Claims: 1. A drawer frame provided with a frame-side contact member, and a main body-side contact member which is capable of coming into contact with and separating from the frame-side contact member and moving in the drawer frame. A drawer-type circuit breaker comprising: a circuit breaker main body; a engaging member provided on the circuit breaker main body and having a circumferential engaging portion; an operating shaft extending in a moving direction of the circuit breaker main body; An operation shaft holding member that restricts the operation shaft from moving in the axial direction on the circuit breaker main body and rotatably holds the operation shaft; a male screw and a female screw formed in the operation shaft and the axial direction are interconnected; A connection shaft that moves in the axial direction by rotating the operation shaft, and is provided rotatably on the drawer frame, an engagement edge with the engagement member is formed near the center of rotation, and The connecting shaft is located at a position away from the engagement edge. And a lever formed with a connecting means, wherein a tangent to the engaging member when the operating shaft is rotated in the insertion operation of the circuit breaker body is such that a tangent to the engagement member is inserted into the circuit breaker body. A first engagement edge formed so as to be substantially parallel to the direction, and an engagement edge in which the engagement member engages subsequent to the engagement with the first engagement edge. And a second engaging edge formed so that a tangent line of the circuit breaker is inclined in a direction in which the circuit breaker body is inserted.