JP3492189B2 - Shutter device for draw-out type circuit breaker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter device for a draw-out circuit breaker, and more particularly to a shutter device for automatically covering the terminals of a mounting frame to prevent an electric shock accident when the breaker body is pulled out. .

[0002]

2. Description of the Related Art An example of a conventional shutter device for a draw-out type circuit breaker is disclosed in Japanese Patent Application Laid-Open No. 9-161625. This drawer-type circuit breaker has a structure in which the terminals of the mounting frame and the terminals of the circuit breaker main body contact each other on their opposing surfaces, and the terminals on the mounting frame side are covered with fixed insulators on the top and bottom sides, Only when the main body of the breaker is pulled out, the contact surface with the main body terminal is covered with a movable shutter plate to prevent an electric shock accident due to contact with the terminal of the mounting frame which is the charging part.

In this shutter device, both ends of the shutter plate are attached to a pair of shutter holding plates which are horizontally movable in the pulling out / inserting direction of the breaker body on the side plates facing each other of the mounting frame. This shutter holding plate has an inclined guide groove for guiding the movement of the shutter plate.When the main body of the circuit breaker 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 blocked, the shutter plate moves in the vertical direction along the guide groove of the shutter holding plate to expose the contact surface, and the contact with the main body terminal becomes possible.

[0004]

In this conventional shutter device, a small shutter plate is sufficient because the upper and lower and side surfaces of the mounting frame terminal are covered with fixed insulators, and the shutter device is driven in the breaker body. There is a feature that a special member for doing so is unnecessary. However, since the shutter plate has a structure in which both ends thereof are fixed with screws or rivets and the like, the shutter plate has a problem in assembly when the inner dimensions of the side plates facing each other vary. Especially for relatively large circuit breakers, it is more difficult to ensure this dimension accurately. For this reason, there has been a problem that precise dimensional control must be performed in processing and assembling the mounting frame and the shutter device. Further, screwing and rivet work are required, and the assembling work is complicated.

The present invention has been made to solve the above conventional problems, and provides a drawer type circuit breaker shutter device that does not require precision machining of parts and is easy to assemble. The purpose is to

[0006]

In order to achieve such an object, the invention according to claim 1 has a mounting frame having side plates facing each other, and a shutoff for horizontally moving inside the mounting frame along the side plates. A shutter device for a drawer type circuit breaker comprising a main body of a circuit breaker, comprising a pair of horizontal slide members respectively provided on side plates facing each other and biased in a pulling direction of the main body of the breaker, and corresponding horizontal slide members. A pair of upper and lower slide members provided to be movable in the vertical direction,
The pair of upper and lower slide members are provided with shutter plates whose both ends are held in the mounting frame, and the operation body having inclined sides for moving the upper and lower slide members upward or downward is provided in the circuit breaker body . Operation member when inserting the main body
The vertical slide member has moved to the end of its movement range
After that, move the horizontal slide member in the insertion direction of the circuit breaker body.
The vertical slide member is a horizontal slide.
Through the vertical guide hole formed in the member,
The stud protruding in the direction of
With tubular bushing attached, studs are vertical
Elasticity that is divided into two parts to form a groove in the direction
It consists of a member and the tip is larger than the inner diameter of the bushing
The overhang is formed and the shutter plate is fitted in the groove of the stud.
It is characterized by being held by being held . With this feature, the shutter plate is held by simply fitting it into the groove of the stud of the vertical slide member without being fixed to other parts, so that the dimension in the width direction is precisely controlled during parts processing and assembly. No need. Also, slide up and down
The stud of the member is made up of two elastic members
Therefore, bend it once and make it a guide hole smaller than the tip.
Insert the bushing or insert a bushing whose inner diameter is smaller than its tip.
Even if it is inserted in the tod, its tip penetrates through the hole or inside the cylinder.
If so, it will return to its original state and will not fall off,
Is easy. Also, so that vertical grooves are formed
Since it is divided into two, the shutter plate can be held vertically,
You can surely cover the child.

[0007]

[0008] According to a second aspect of the invention, in the invention according to the first and bush has a first engagement portion and second engagement portion
The hook that is rotatably held by the ring and the hook
With a spring that biases the circuit breaker in the opposite direction.
The first force of the hook is
The engaging part is horizontal so as to prevent the opening operation of the shutter plate.
The second engaging portion of the hook engages with the ride member, and the second engaging portion of the hook engages with the first engaging member.
The engagement between the joint and the horizontal slide member is released, and
When the shutter plate is moved to the open position, the shutter plate
Engage with a horizontal slide member to hold it in the open position,
The engagement of the first or second engagement portion in the engagement state,
When inserting the breaker body, the operating member moves the hook in the other direction.
It is characterized in that it is eliminated by rotating it. With such a feature, it is safe that the shutter plate is not inadvertently opened when the circuit breaker body is pulled out, and it can be held in the opened state, which facilitates maintenance and inspection.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to 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, which is composed of a mounting frame 1 and a circuit breaker main body 2, and the circuit breaker main body 2 is inserted into the mounting frame 1. It shows the state. The mounting frame 1 is provided with a power source side terminal 3 and a load side terminal 4, and the circuit breaker main body 2 is formed on a base 5 of a molded insulating material. Withdrawal contacts 6, 6 and 7, 7 are provided to be connected. The draw-out contacts 6, 6 and 7, 7 contact the draw-out contact ends 3a and 4a of the power-side terminal 3 and the load-side terminal 4 so as to sandwich the upper and lower surfaces thereof, respectively, and the breaker body 2 of FIG. 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 draw-out contacts 7, 7 are vertically symmetrical with the power supply side terminal 3 and the draw-out contacts 6, 6, and correspondingly, the shutter device of this embodiment is also vertically symmetrical. Is configured.

FIG. 2 is a circuit breaker main body 2 of a three-pole type circuit breaker.
FIG. 2 is a view of the mounting frame 1 after pulling out the drawing from the left side in FIG. 1, and the shutter device of this embodiment has a pair of upper and lower side plates 8 and 8 mounted so as to face each other. Shutter plates 9, 9 and 10, 10 of which both ends are held respectively.
And 12 are configured to cover the power supply side terminal 3 and the load side terminal 4 for three poles. Note that, in FIG. 2, for convenience, the drawing contact end 3a of the power supply side terminal 3 is covered by the shutter plate 11 on the upper side (the shutter device is closed).
The state, the lower side, shows the state in which the pull-out contact end 4a of the load-side terminal 4 is exposed (the shutter device is open). As described above, since the upper and lower shutter devices are the same in configuration and are arranged symmetrically with respect to each other, the following description will be given mainly on the upper shutter device.

FIG. 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 main parts. The upper side of the right pole is bilaterally symmetrical to the left pole, and the configuration is the same, so the description is omitted. The shutter unit 9 has 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 thereof are aligned in the horizontal direction, and the guide shaft 19 provided on the opposing arm 13a is provided with a spring 20 to the breaker. Body 2
Horizontal slide member 14 urged in the direction of pulling out
Is movably attached.

The horizontal slide member 14 is formed in the shape of an arrow pointing downward and has a lock engaging portion 14a at its lower end, a vertically elongated hole 14b at its central portion, and a holding engaging portion 14c at the upper end of the elongated hole 14b. However, a pad lock hole 14d is formed in one flange portion of the arrow. A main stud 16 and a guide stud 17, each of which has an entire horizontal width in the horizontal direction at its tip end larger than the width of the elongated hole 14b and a leg portion smaller than that width, are erected on the vertical slide member 15 made of an elastic molded product. It is divided into two so as to form a vertical groove 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 is formed in a cylindrical shape having an inner diameter smaller than the tip portion of the main stud 16 and larger than the leg portion. The hook 18 includes 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 18 of the bushing 21.
c is formed and the working stud 22 is attached.

The upper and lower slide members 15, bushings 21, and hooks 18 are attached to the horizontal slide member 14. The attachment method is that the main stud 16 and the guide stud 17 are first separated from the side plate 8 side in the respective dividing directions. When it is inserted into the elongated hole 14b while being bent, and is set in a free state, it returns to the upright state due to elasticity, and since the respective tip portions are larger than the width of the elongated hole 14b, the vertical slide member 15 does not come off from the horizontal slide member 14. Both legs act as guides to move the vertical slide member 15 into the long hole 14
Allows up and down movement along b. Bushing 21
With the round hole 18a of the hook 18 fitted in the small outer peripheral portion 21a, the hollow portion is inserted from the tip of the main stud 16 and attached to the main stud 16. The main stud 16 is curved during the mounting as described above, but when the mounting is completed, the bushing 21 is fitted into the leg portion of the main stud 16,
Since the main stud 16 returns to the upright state and its tip is larger than the inner diameter of the bushing 21, the bushing 21 does not fall off the main stud 16, and the hook 18 is rotatably held around the bushing 21.

In this way, the shutter plate 1 is inserted into the dividing grooves of the respective guide studs 17, 17 of the symmetrical shutter units 9, 9 attached to the side plates 8, 8 facing each other.
The shutter plate 11 can be held in the vertical direction by fitting the upper end portions 11a and 11a of 1 and fitting the lower end portions 11b and 11b into the dividing grooves of the main studs 16 and 16. Since the shutter plate 11 attached in this manner is not fixed to other parts, the accuracy of the width dimension of the shutter plate 11 may be such that it does not fall off the guide stud 17 or the main stud 18. In this attachment, the shutter units 9 and 9 may be attached to the side plates 8 and 8 and then the shutter plate 11 may be slightly curved and fitted, or the shutter units 9 and 9 may be fitted to the side plates 8 and 8 first. May be attached.

On the other hand, as shown in FIG. 7, a pair of fixed insulating cylinders 23 and movable insulating cylinders 24, which are made of rectangular cylindrical insulating molded products, are provided on the lead-out contact ends 3a of the power source side terminals 3. The movable insulating cylinder 24 is attached and biased by the spring 25 in the direction of the tip of the pull-out contact end 3a, and in the free state, it cooperates with the fixed insulating cylinder 23 to cover the top and bottom and the side of the pull-out contact end 3a up to the tip.

The operation of the shutter device having such a configuration will be described. FIG. 4 shows a state before the breaker main 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 vertical slide member 15 is set by the spring (not shown). At the lowermost 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 the hook 18 in the counterclockwise direction. The top and bottom and right and left sides of the pull-out contact end 3a are covered by the fixed insulating cylinder 23 and the movable insulating cylinder 24 up to the tip thereof, and the end face of the tip is covered by the shutter plate 11. Note that, in FIGS. 4 and 5, the shutter plate 11 is represented by the XX cross section in FIG. 3.

In this state, since the lock hook portion 18b engages with the lock engaging 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. Can be secured. Further, by attaching a padlock to the pad lock hole 14d, more safety can be secured.

When the main body 2 of the circuit breaker is inserted into the mounting frame 1 from the state shown in FIG. 4, the operating plate 26 attached to the main body 2 of the circuit breaker moves to the right and the operating stud 22 is attached to the inclined edge 26a thereof. Abut. When the operation is further continued, the operation stud 22 moves on the inclined edge 26a and the hook 18 moves.
Is rotated clockwise so that the lock hook portion 18b is not engaged with the lock engaging portion 14a, and then the inclined edge 26a contacts the large outer peripheral portion 21b of the bushing 21 so that the large outer peripheral portion 21b becomes the inclined edge 26a. Along with the upward movement, the vertical slide member 15 moves upward together with the hook 18 and the shutter plate 11, and the tip end face of the drawer contact end 3a is exposed. Then, the guide stud 17 has the long hole 14b.
When the upper end of the vertical slide member 15 is reached, the upward movement of the vertical slide member 15 is restricted, so that the horizontal slide member 14 moves rightward along with the vertical slide member 15 and the state shown in FIG.

When the circuit breaker main body 2 moves to the right in this insertion operation, the opening of the base 5 for housing the drawer contact 6 is shown in FIG. 8 which shows the vicinity of the drawer contact 6 from the right in FIG. The edge of the operation protrusion 24a is pushed by the edge opening edge 5a and the movable insulating cylinder 24 is moved to the right to expose the top and bottom and the left and right of the drawer contact end 3a, so that the drawer contact 6 and the drawer contact end 3a. Contact.

When the circuit breaker main body 2 is pulled out from this state, the operating plate 26 moves to the left, so that the horizontal slide member 14 first moves to the left, and then the vertical slide member 15 moves downward to move the shutter. The plate 11 covers the tip end surface of the pull-out contact end 3a, and the hook 18 further rotates in the clockwise direction so that the lock hook portion 18b can be engaged with the lock engaging portion 14a. On the other hand, the movable insulating cylinder 24 also moves to the left due to the action of the spring 25 to the state shown in FIG.
The front surface of a is covered with an insulator.

In this shutter device, the shutter plate 11 can be opened with the breaker body 2 pulled out for maintenance and inspection. That is, the hook 18 is rotated clockwise by hand to move the hook 18 together with the vertical slide member 15.
Should be moved upwards. Further, when the hook 18 is rotated counterclockwise while the shutter plate 11 is raised, the holding hook portion 18c engages with the holding engagement portion 14c and the shutter plate 11 can be held in the opened state. All maintenance and inspection work is possible. From this state, the shutter plate 11
In order to close, the hook 18 may be rotated clockwise and lowered downward. Even if the user accidentally forgets to close the operation and inserts the circuit breaker main body 2, the operating plate 26 rotates the hook 18 counterclockwise to the state shown in FIG. Since the plate 11 automatically covers the pull-out contact end 3a as described above, no safety problem occurs.

[0022]

As described above, in the shutter device of the drawer type circuit breaker according to the present invention, the shutter plate is the upper and lower slide plates.
Since it is held only by being fitted in the groove of the stud, there is no need to make the processing precision of the parts precise, and there is an effect that it is inexpensive and easy to assemble.

[Brief description of drawings]

FIG. 1 is a side sectional view of a main 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 a mounting frame from which the circuit breaker body of FIG. 1 has been removed.

3 is a front view of the shutter device of FIG. 1 before the breaker body is inserted.

FIG. 4 is a side view of FIG.

5 is a side view of the shutter device of FIG. 1 after the breaker body is inserted.

FIG. 6 is an exploded perspective view of a main part of the shutter device in FIG.

FIG. 7 is a partially exploded perspective view of the shutter device of FIG.

FIG. 8 is a partial view illustrating a circuit breaker body of the circuit breaker of FIG.

[Explanation of symbols] 1 mounting frame 2 Circuit breaker body 3 Power supply side terminal 4 Load side terminal 3a, 4a Draw-out contact end 5 base 5a Opening edge 6,7 Drawout contact 8 side plates 9,10 Shutter unit 11,12 Shutter plate 11a end 13 Unit mounting plate 14 Horizontal slide member 14a Lock engaging part 14b long hole 14c holding engagement part 15 Vertical slide member 16 Main stud 17 Guide stud 18 hooks 18b Lock hook part 18c Holding hook part 21 bushings 21a Small outer peripheral portion 21b Large outer circumference 22 Working studs 23 Fixed insulating cylinder 24 Movable insulation tube 24a Operation convex part 25 springs 26 Action Board 26a inclined edge

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-53-120180 (JP, A) JP-A-10-42410 (JP, A) Actually opened 63-93703 (JP, U) Actually opened 61- 22114 (JP, U) Actually open 62-78009 (JP, U) Actually open 61-10013 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02B 11/24

Claims (2)

(57) [Claims] 1. A mounting frame having side plates facing each other,
A shutter device for a drawer type circuit breaker comprising a circuit breaker body that moves horizontally in the mounting frame along the side plate, wherein the shutter device is provided on each of the side plates facing each other in the drawing direction of the circuit breaker body. A pair of biased horizontal slide members, and a pair of vertical slide members provided on the corresponding horizontal slide members so as to be vertically movable.
Wherein a pair of shutter plates which both ends are held in the vertical sliding member provided on the mounting frame, provided with an operation member which inclined sides are formed for moving the vertical slide member upward or downward on the breaker main body, wherein When inserting the breaker body, the operating member
After the slide member has moved to the end of its movement range
Move the horizontal slide member in the insertion direction of the circuit breaker body.
The vertical slide member is formed on the horizontal slide member.
The shutter plate through the vertical guide hole
Attached to the outside of the stud and the stud
With a cylindrical bushing, the stud is vertical
Elastic part that is divided into two parts to stand in such a way that a facing groove is formed
It is made of a material and its tip is larger than the inner diameter of the bushing.
An overhang is formed, and the shutter plate is attached to the stud.
A shutter device for a drawer-type circuit breaker, which is fitted and held in the groove . 2. A first engaging portion and a second engaging portion, and
A hook that is rotatably held by the bushing;
A spring for urging the hook to rotate in one direction, and in a state where the breaker body is pulled out,
Due to the bias, the first engaging portion of the hook is
The horizontal slide member so as to prevent the opening operation of the plate.
And the second engaging portion of the hook engages with the first engaging
Section and the horizontal slide member
When the shutter plate is moved to the open position, the shutter
The horizontal slide to hold the plate in its open position.
The engagement of the first or second engagement portion engaged with the member and in the engagement state
Means that when the circuit breaker body is inserted, the operating member
Resolved by rotating the hook in the other direction
Drawer-type circuit breaker of the shutter device according to claim 1, characterized in that that.