JP3659610B2 - Drawer type circuit breaker shutter device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shutter device for a drawer type circuit breaker, and more particularly to a shutter device that automatically covers a terminal of a mounting frame to prevent an electric shock accident when a breaker body is pulled out.
[0002]
[Prior art]
An example of a conventional shutter device for a drawer type circuit breaker is disclosed in Japanese Patent Laid-Open No. 9-161625. This pull-out type circuit breaker has a structure in which the terminal of the mounting frame and the terminal of the circuit breaker body are in contact with each other on the opposing surface, and the terminal on the mounting frame side is covered with a fixed insulator on the top and bottom, Only when the circuit breaker main body is pulled out, the contact surface with the main body terminal is covered with a movable shutter plate so as to prevent an electric shock accident due to contact with the terminal of the mounting frame as a charging unit.
[0003]
In this shutter device, both ends of a shutter plate are attached to a pair of shutter holding plates that are horizontally movable in the drawing / insertion direction of the circuit breaker body on the side plates facing the mounting frame. The shutter holding plate is formed with an inclined guide groove for guiding the movement of the shutter plate. When the circuit breaker body is inserted, the shutter holding plate is moved horizontally together with the shutter plate so that the shutter plate contacts the mounting frame terminal. After the contact and the movement in the horizontal direction are prevented, the shutter plate moves in the vertical direction along the guide groove of the shutter holding plate, and a contact surface appears, allowing contact with the main body terminal.
[0004]
[Problems to be solved by the invention]
In this conventional shutter device, the upper and lower sides and side surfaces of the mounting frame terminal are covered with a fixed insulator, so a small shutter plate is sufficient, and a special member for driving the shutter device is not required in the circuit breaker body. There is a feature that becomes. However, since this conventional pull-out type circuit breaker has a structure in which the terminal of the mounting frame and the terminal of the breaker body are in contact with each other on the opposite surface, such an insulator could be fixedly provided. Depending on the circuit breaker, the contactor of the circuit breaker main body slides on the terminal of the mounting frame in the insertion direction to make contact in the insertion operation, and such a circuit breaker attaches an insulator except for the sliding part. There was a need. However, it is necessary to enlarge the shutter plate so as not to cause an electric shock due to contact with such a sliding portion, and the shutter device must necessarily have a large and strong structure.
[0005]
The present invention has been made in order to solve such a conventional problem, and it is sufficient that the shutter plate can be reliably insulated and the shutter plate is small enough to cover the end face of the terminal. Another object of the present invention is to provide a shutter device for a drawer type circuit breaker that can be miniaturized.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, a shutter device for a drawer type circuit breaker according to the present invention comprises an attachment frame and a breaker body that moves within the attachment frame. In a draw-out type circuit breaker having a breaker body with a contactor that opens and contacts by sliding in the moving direction of the breaker body on a drawer contact end protruding from a terminal provided in the breaker body, the breaker body is pulled out. A shutter device having a shutter plate that automatically covers an end face of the terminal of the mounting frame that faces the circuit breaker body, one end of which is located at the base of the terminal of the terminal of the mounting frame and the other It is provided so that the end is not in contact with the contact by being positioned closer to the base of the terminal's lead-out contact end than the contact that is in sliding contact with the terminal's pull-out contact end in the inserted state of the circuit breaker body. Of the lead-out contact end of the terminal A fixed insulating cylinder for covering the top and bottom and side of Motogawa portions, of the lead contact ends of the terminals in the extracted position of the breaker main body is urged in the direction of the breaker body a movable is drawn along the fixed insulating tube The mounting frame is provided with a movable insulating cylinder provided so as to cover the top and bottom and the side from the base of the lead-out contact end of the terminal in cooperation with the fixed insulating cylinder by covering the top and bottom and side of the tip side portion. The circuit breaker body includes an operation member that moves the movable insulating cylinder in the insertion direction when the circuit breaker body is inserted.
[0007]
And by this structure, before insertion of a circuit breaker main body, the upper and lower sides and the side of the drawing-out contact end of the terminal of a mounting frame are covered with a fixed and movable insulation cylinder, and the end surface facing a circuit breaker main body is covered with a shutter board. When the breaker body is inserted, the shutter plate automatically opens, and the movable insulating cylinder moves in the insertion direction, and a sliding contact portion with the breaker body appears. When pulling out, the entire top and bottom and sides of the terminal are automatically covered with an insulating material by an urging force, and the end face is also covered with a shutter plate.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the present invention will be described with reference to the examples shown in FIGS.
FIG. 1 is a side sectional view of a drawer type circuit breaker equipped with a shutter device according to this embodiment. The drawing type circuit breaker includes a mounting frame 1 and a circuit breaker body 2, and the circuit breaker body 2 is inserted into the mounting frame 1. It shows the state. The mounting frame 1 is provided with a power supply side terminal 3 and a load side terminal 4, and the circuit breaker body 2 is formed on a base 5 of a molded insulator, and serves as a main circuit conductive part such as an opening / closing contact part of the circuit breaker body 2. Connected drawer contacts 6, 6 and 7, 7 are provided. The drawing contacts 6, 6, 7 and 7 are in contact with each other so as to sandwich the upper and lower surfaces of the drawing contact ends 3a and 4a of the power supply side terminal 3 and the load side terminal 4, respectively. When moved to the left, they are separated from the power supply side terminal 3 and the load side terminal 4, respectively. The load side terminal 4 and the drawing contacts 7 and 7 are vertically symmetrical with the power supply side terminal 3 and the drawing contacts 6 and 6, and the shutter device of this embodiment is similarly symmetrical with respect to this. It is configured.
[0009]
FIG. 2 is a view of the mounting frame 1 after pulling out the circuit breaker body 2 of the three-pole circuit breaker as viewed from the left in FIG. 1, and the shutter device of this embodiment has a pair of opposing side plates. The power supply side terminals 3 and 3 for three poles are respectively provided by shutter plates 11 and 12 which are held at both ends by a pair of upper and lower shutter units 9, 9 and 10 and 10 mounted so as to face each other. It is comprised so that the load side terminal 4 may be covered. In FIG. 2, for convenience, the upper side is a state in which the drawing contact end 3 a of the power supply side terminal 3 is covered by the shutter plate 11 (the shutter device is closed), and the lower side is a drawing contact end of the load side terminal 4. 4a shows an exposed state (the shutter device is opened). As described above, since the upper and lower shutter devices are only arranged in the same configuration and symmetrically with each other, the following description will mainly describe the upper shutter device.
[0010]
3 is a front view showing the upper side of the left pole in FIG. 2, FIG. 4 is a side view thereof, and FIG. 6 is an exploded perspective view of the main part. Since the upper side of the right pole is bilaterally symmetrical with the left pole and the configuration is the same, the description is omitted. The shutter unit 9 includes a unit mounting plate 13, a horizontal slide member 14, a vertical slide member 15, and a hook 18. A unit mounting plate 13 having a U-shaped cross section is attached to the side plate 8 so that the opposing arms 13a are aligned in the horizontal direction, and a guide shaft 19 provided on the opposing arms 13a is attached to a circuit breaker by a spring 20. A horizontal slide member 14 urged in a direction in which the main body 2 is pulled out is attached to be movable.
[0011]
The horizontal slide member 14 is formed in a substantially arrow shape downward, a lock engagement portion 14a at the lower end, a vertical long hole 14b at the center, and a holding engagement portion 14c at the upper end of the long hole 14b. A pad lock hole 14d is formed in one of the flange portions. The upper and lower slide members 15 made of an elastic molded product are provided with main studs 16 and guide studs 17 having a total width in the horizontal direction of the tip portion larger than the width of the long hole 14b and a leg portion smaller than the width, respectively. It is divided into two so that a vertical groove is formed in the standing direction. The bushing 21 has a small outer peripheral portion 21a and a large outer peripheral portion 21b having different diameters, and an inner diameter thereof is smaller than a tip portion of the main stud 16 and larger than a leg portion. The hook 18 is formed with a round hole 18a having a diameter larger than the small outer peripheral portion 21a of the bushing 21 and smaller than the large outer peripheral portion 21b, a lock hook portion 18b, and a holding hook portion 18c, and an operation stud 22 is attached thereto.
[0012]
These upper and lower slide members 15, bushing 21, and hook 18 are attached to the horizontal slide member 14. The attachment method is as follows. First, the main stud 16 and the guide stud 17 are curved in the respective dividing directions from the side plate 8 side. When inserted into the long hole 14b and in a free state, it returns to an upright state due to elasticity, and since the respective tip portions are larger than the width of the long hole 14b, the upper and lower slide members 15 do not come off the horizontal slide member 14, and both legs The portion exhibits a guide action and allows the vertical slide member 15 to move up and down along the long hole 14b. The bushing 21 is attached to the main stud 16 by inserting the hollow portion from the tip end portion of the main stud 16 with the round hole 18a of the hook 18 fitted into the small outer peripheral portion 21a. During the mounting, the main stud 16 is curved in the same manner as described above, but when the mounting is completed, the bushing 21 fits in the leg portion of the main stud 16, the main stud 16 returns to the upright state, and the tip end portion thereof is from the inner diameter of the bushing 21. Since the bushing 21 is large, the bushing 21 does not fall off from the main stud 16, and the hook 18 is rotatably held around the bushing 21.
[0013]
The upper end portions 11a and 11a of the shutter plate 11 are fitted into the dividing grooves of the guide studs 17 and 17 of the left and right symmetrical shutter units 9 and 9 attached to the opposing side plates 8 and 8, respectively. The shutter plate 11 can be held in the vertical direction by fitting the lower ends 11b and 11b into the 16 and 16 dividing grooves. Since the shutter plate 11 attached in this way is not fixed to other parts, the accuracy of the width dimension of the shutter plate 11 only needs to be such that it does not fall off from the guide stud 17 or the main stud 18. In this attachment, the shutter units 9 and 9 may be fitted to the side plates 8 and 8 and then the shutter plate 11 may be fitted in a slightly curved shape, and the shutter units 9 and 9 may be fitted to the side plates 8 and 8 after being fitted first. It may be attached.
[0014]
On the other hand, as well shown in FIG. 7, a set of fixed insulating cylinders 23 and a movable insulating cylinder 24 made of a rectangular cylindrical insulating molded product are attached to the drawing contact end 3 a of the power source side terminal 3. The movable insulating cylinder 24 is biased by the spring 25 in the direction of the distal end portion of the drawer contact end 3a, and covers the upper and lower sides and the side to the distal end of the drawer contact end 3a together with the fixed insulating cylinder 23 in a free state.
[0015]
The operation of the shutter device having such a configuration will be described.
FIG. 4 shows a state before the circuit breaker body 2 is inserted into the mounting frame 1. The horizontal slide member 14 is at the leftmost end of the movable range by the spring 20, and the upper and lower slide member 15 is moved by the spring (not shown). At the lowest end of the movable range, the hook 18 is in a position where the lock hook portion 18b and the lock engaging portion 14a can be engaged by a spring (not shown) that urges counterclockwise. In addition, the upper and lower sides and the left and right sides of the drawer contact end 3 a are covered to the tip by the fixed insulating cylinder 23 and the movable insulating cylinder 24, and the end surface of the tip is covered by the shutter plate 11. 4 and 5, the shutter plate 11 is represented by the XX cross section of FIG.
[0016]
In this state, since the lock hook portion 18b engages with the lock engagement portion 14a, the horizontal slide member 14 cannot be inadvertently slid upward, so that the front surface of the drawer contact end 3a is covered with an insulating material to ensure safety. . Further, the safety can be secured by attaching a padlock to the pad lock hole 14d.
[0017]
When the operation of inserting the circuit breaker body 2 into the mounting frame 1 from the state of FIG. 4 is performed, the operation plate 26 attached to the circuit breaker body 2 moves rightward and the operation stud 22 contacts the inclined edge 26a. . When the operation is further continued, the hook 18 is rotated clockwise while the operation stud 22 moves on the inclined edge 26a, so that the lock hook portion 18b is not engaged with the lock engaging portion 14a. As the large outer peripheral portion 21b moves upward along the inclined edge 26a in contact with the large outer peripheral portion 21b, the upper and lower slide members 15 move upward together with the hook 18 and the shutter plate 11 and the drawer contact end 3a The end face of the tip is exposed. When the guide stud 17 reaches the upper end of the long hole 14b, the upward movement of the vertical slide member 15 is restricted, so that the horizontal slide member 14 moves to the right along with the vertical slide member 15 and the like as shown in FIG. It becomes a state.
[0018]
When the circuit breaker body 2 moves to the right in this insertion operation, the opening edge opening of the base 5 that houses the drawing contact 6 in FIG. 8 shows the state of the drawing contact 6 seen from the right in FIG. The portion of the operation convex portion 24a is pushed by the edge portion 5a and the movable insulating cylinder 24 is moved rightward to expose the top, bottom, left and right of the drawer contact end 3a, and the drawer contact 6 contacts the drawer contact end 3a.
[0019]
When the circuit breaker body 2 is pulled out from this state, the operation plate 26 moves to the left, so that the horizontal slide member 14 first moves to the left, and then the upper and lower slide members 15 move downward so that the shutter plate 11 moves. The front end face of the pull-out contact end 3a is covered, and the hook 18 is further rotated in the clockwise direction so that the lock hook portion 18b can be engaged with the lock engagement portion 14a. On the other hand, the movable insulating cylinder 24 is also moved leftward by the action of the spring 25 to be in the state shown in FIG. 4, and the front surface of the drawer contact end 3a is covered with an insulator.
[0020]
This shutter device can open the shutter plate 11 with the circuit breaker body 2 pulled out for maintenance and inspection. That is, the hook 18 may be rotated clockwise by hand, and the vertical slide member 15 may be moved upward together with the hook 18. Further, when the hook 18 is rotated counterclockwise with the shutter plate 11 raised upward, the holding hook portion 18c can be engaged with the holding engagement portion 14c and the shutter plate 11 can be held open, and both hands can be used. All maintenance and inspection work becomes possible. In order to close the shutter plate 11 from this state, the hook 18 may be rotated clockwise and lowered downward. Even if the circuit breaker body 2 is inserted by forgetting to close it accidentally, the operating plate 26 rotates the hook 18 counterclockwise to the state shown in FIG. Since the plate 11 automatically covers the drawing contact end 3a as described above, there is no safety problem.
[0021]
【The invention's effect】
As described above, since the shutter device for a drawer type circuit breaker according to the present invention has a fixed insulator and a movable insulator attached around the drawing contact end of the terminal of the mounting frame, these insulators are small and reliable. In addition, it is sufficient that the shutter plate is small enough to cover the end face of the terminal, and the operation device for operating the shutter plate can be downsized.
[Brief description of the drawings]
FIG. 1 is a side sectional view of an essential part of a drawer type circuit breaker equipped with a shutter device according to an embodiment of the present invention.
FIG. 2 is a front view of the mounting frame from which the breaker body of FIG. 1 is removed.
FIG. 3 is a front view of the shutter device of FIG. 1 before inserting a circuit breaker body.
4 is a side view of FIG. 3. FIG.
FIG. 5 is a side view of the shutter device of FIG. 1 after insertion of a circuit breaker body.
6 is an exploded perspective view of a main part of the shutter device of FIG. 1. FIG.
7 is a partially exploded perspective view of the shutter device of FIG. 1. FIG.
FIG. 8 is a partial view illustrating a circuit breaker body of the circuit breaker of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mounting frame 2 Circuit breaker main body 3 Power supply side terminal 4 Load side terminal 3a, 4a Draw-out contact end 5 Base 5a Opening edge part 6, 7 Draw-out contact 8 Side plate 9, 10 Shutter unit 11, 12 Shutter plate 11a End part 13 Unit Mounting plate 14 Horizontal slide member 14a Lock engagement portion 14b Long hole 14c Holding engagement portion 15 Vertical slide member 16 Main stud 17 Guide stud 18 Hook 18b Lock hook portion 18c Holding hook portion 21 Bushing 21a Small outer peripheral portion 21b Large outer peripheral portion 22 Operating stud 23 Fixed insulating cylinder 24 Movable insulating cylinder 24a Operating projection 25 Spring 26 Operating plate 26a Inclined edge

Claims (1)

The breaker body moves on a pulling contact end formed from a terminal provided on the mounting frame when the breaker body is pulled out / inserted, and includes a mounting frame and a circuit breaker body that moves in the mounting frame. In a pull-out type circuit breaker having a breaker body that has a contactor that slides in a direction to open and contact, the breaker body at the drawing contact end of the terminal of the mounting frame automatically when the breaker body is pulled out A shutter device having a shutter plate covering an end surface facing
One end of the terminal is positioned at the base of the pull-out contact end of the terminal of the mounting frame, and the other end is pulled out of the contactor in sliding contact with the pull-out contact end of the terminal in the inserted state of the breaker body. A fixed insulating cylinder that is provided on the base side of the contact end so as not to come into contact with the contact and covers the top and bottom and the side of the base side portion of the lead-out contact end of the terminal;
It is movable along the fixed insulating cylinder and is urged in the direction in which the breaker body is pulled out, and covers the top and bottom and the side of the tip side portion of the drawing contact end of the terminal when the breaker body is pulled out. The mounting frame includes a movable insulating cylinder provided so as to cover the top and bottom and the side from the base to the tip of the lead-out contact end of the terminal in cooperation with the fixed insulating cylinder, and the breaker body is inserted. A shutter device for a draw-out type circuit breaker, characterized in that an operating member for moving the movable insulating cylinder in the insertion direction is provided in the breaker body.

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