JPH10191512A - Drawer-type circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drawer-type circuit breaker for easily pushing a truck into a cradle. SOLUTION: When a projecting part 21 (gear-lock part) is provided at the front side of a cradle 1 for accommodating a circuit breaker 4 and a truck 2 is withdrawn toward the front side of the cradle 1, one edge 17C of a rod- shaped handle 17 is gear-locked to the projecting part 21 and at the same time a middle part 17B of a rod-shaped handle 17 is brought into contact with a roller 7 of the truck 2, the other edge 17A of the handle 17 is moved to the side of the truck 2 with the projecting part 21 as a support, and the truck 2 is pushed to the deep side of the cradle 1 and at the same time a shutter 3 is moved upward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawer-type circuit breaker which is horizontally moved into and out of a cradle of a switchboard, and more particularly to a drawer-type circuit breaker which can be easily pushed into a cradle.

[0002]

2. Description of the Related Art FIG. 10 is a front view showing the structure of a conventional draw-out circuit breaker. A cradle 1 for accommodating a circuit breaker is disposed in a switchboard (not shown), and a trolley 2 is mounted on a bottom plate 1A of the cradle 1 via wheels 13. A section steel 10 (channel steel) is welded to the center of the bottom plate 1A, and a rail 9 is welded on the section steel 10. On the other hand, a guide 8 is attached to the lower part of the carriage 2 and a rail 9
The guide 8 is fitted into the guide. Further, a U-shaped support 6 is mounted on the carriage 2 with its bottom portion disposed on the depth side, and a roller 7 is rotatably mounted on the support 6 via a pin 6A. The roller 7 protrudes forward from the notch 5 of the carriage 2. A handle 2 </ b> A is attached to the front side of the cart 2, a shutter 3 is attached to the cradle 1, and faces the depth side of the cart 2. Operation pieces 14 of the shutter 3 are attached to the left and right sides of the carriage 2,
The shutter 3 is moved up and down via an operation mechanism (not shown) (to be described later).

FIG. 11 is a view taken in the direction of arrow B in FIG.
The side plate of the cradle 1 of FIG. 10 is partially crushed to show the internal configuration. A circuit breaker 4 is mounted on the cart 2, and the circuit breaker 4 includes a movable contact 5A on a depth side (right side). On the other hand, a fixed contact 5B (dotted line) is attached to the cradle 1 via a supporting insulator tube 12. That is, the fixed contact 5B is housed inside the support insulator tube 12,
The right end of the fixed contact 5B is supported by the support insulator 12, and the left end of the fixed contact 5B faces the movable contact 5A. The right end of the fixed contact 5B is connected to a main circuit (not shown) in the switchboard. Fixed contact 5B and movable contact 5A
, A shutter 3 is interposed. A roller 15 of an operation mechanism described later is in contact with the operation piece 14.

FIG. 12 is an enlarged perspective view of a main part of FIG. 11, which is an enlarged view showing the vicinity of the left end of the bottom plate 1A.
A square hole 16 penetrates the rail 9 provided on the section steel 10. Returning to FIG. 11, this state is a configuration diagram when the fixed contact 5B and the movable contact 5A are separated from each other and the circuit breaker 4 is in a test state. The fixed contact 5B remains charged because it is connected to the main circuit. Therefore, from the viewpoint of safety, the fixed contact 5B is closed by the shutter 3, so that the charging section cannot be touched by a person. In order to put the circuit breaker 4 into the operating state, a person needs to hold the handle 2A.
And presses the carriage 2 rightward to bring the fixed contact 5B and the movable contact 5A into contact.

FIG. 13 is a partially broken side view when the drawer-type circuit breaker of FIG. 11 is in operation. The carriage 2 is pressed horizontally to the right, and the movable contact 5A is fitted into the inside of the support insulator 12 and is in contact with the fixed contact 5B. At this time, the shutter 3 is moving upward. At this position, the lower end 17C of the rod-shaped handle 17 is
And the roller 17 </ b> B abuts on the way 17 </ b> B. With this handle 17, the carriage 2 is moved as shown in FIG.
It is firmly fixed at position 3. In order to return the circuit breaker 4 to the test state, after pulling out the handle 17 from the square hole 16, a person holds the handle 2A, pulls out the cart 2 to the left, and opens the fixed contact 5B and the movable contact 5A. Let go.

[0006] Cradle 1 is an English cradle.
le (cradle), which comes from the meaning of storing the circuit breaker 4. A plurality of cradles 1 are arranged vertically and horizontally inside a switchboard, and a circuit breaker 4 that can be inserted into and removed from each cradle 1 is housed. FIG. 13 shows only one of the plurality of cradles 1 arranged in the switchboard.

FIG. 14 is a side view of a main part showing a shutter operation mechanism of the drawer-type circuit breaker of FIG. An operation piece 14 fixed to a trolley (not shown) has a horizontal surface 1 on its upper surface.
4B, and a slope 14A at the upper right end thereof. The roller 15 is in contact with the slope 14A. The roller 15 is rotatably attached to one end of a V-shaped lever 19. The V-shaped lever 19 includes a fixing pin 18 that is rotatably fixed to a cradle (not shown). The other end 19A of the V-shaped lever 19 is
The rail 20 is supported rotatably. This rail 2
0 and the rail 3
Is vertically movable by a guide (not shown) on the cradle side. Another set of shutter operation mechanisms is provided on the near side in the figure, and the shutter 3 extends between two rails 20. A fixed contact 5 </ b> B is arranged to face the shutter 3. The three fixed contacts 5B are provided on the near side of the figure, and the three fixed contacts 5B are provided.
At the same time. FIG. 14 is a configuration diagram in a case where the cart is pulled out to the near side of the cradle. This eliminates an accident that the worker accidentally touches the fixed contact 5B when testing the switchboard.
When the cart is pressed to the depth side of the cradle, the operation piece 14 and the movable contact 5A move horizontally to the right. As a result, the roller 15 rises on the slope 14A of the operation piece 14, so that
The V-shaped lever 19 rotates in the direction C about the fixing pin 18. Therefore, the rail 20 moves upward and the shutter 3 also moves up.

FIG. 15 is a side view of the main part when the shutter 3 of FIG. 14 has been moved upward. Roller 15
Is on the horizontal surface 14B of the operation piece 14, and the shutter 3 is moving upward. Thereby, the movable contact 5A enters the inside of the support insulator 12 and the fixed contact 5B
Contact with.

[0009]

However, the conventional apparatus as described above requires a large force when the shutter mechanism operates because the bogie is pressed by hand when the operating state is changed from the test state. There was a problem. That is, in FIG. 14, the weight of the shutter 3 and the rail 20 is applied to the operation piece 14 as it is, and the worker has a great deal of trouble in pushing the cart into the cradle.

[0010] It is an object of the present invention to provide a drawer-type circuit breaker in which a bogie can be easily pushed into a cradle.

[0011]

According to the present invention, a cradle for accommodating a circuit breaker is provided in a switchboard. The cradle has a horizontal bottom plate and is provided with a cradle in the switchboard. A fixed contact connected to the main circuit of the above and a shutter for closing the fixed contact, a circuit breaker is provided with a movable contact and mounted on a trolley, and the trolley is placed on a cradle bottom plate at a depth side and a front side. When the carriage is pulled out to the front side of the cradle, the movable contact and the fixed contact are separated, and the shutter is interposed between the movable contact and the fixed contact, When the bogie is pushed to the depth side of the cradle, the shutter retreats and the drawer-type circuit breaker in which the movable contact and the fixed contact make conductive contact has a locking portion on the near side of the cradle. When the cart is pulled out to the front side of the cradle, one end of the rod-shaped handle is engaged with the engaging portion, and the middle of the handle is brought into contact with the cart, and the engaging portion is supported by the fulcrum. Then, the other end of the handle may be moved toward the carriage, and the carriage may be pushed into the depth side of the cradle and the shutter may be retracted. Since the force for pressing the other end of the handle is reduced by the leverage principle, the operation of pushing the cart into the cradle becomes easy.

In this configuration, the locking portion may be a projection provided on the bottom plate. By contacting one end of the handle with the surface of the protrusion on the truck side, the protrusion can be used as a locking portion of the handle. Further, in such a configuration, a shaped steel may be joined to the bottom plate, and the locking portion may be a hole provided in the shaped steel. By penetrating one end of the handle through a hole provided in the section steel, the hole of the section steel can be used as a locking portion of the handle.

[0013] In this configuration, the locking portion may be a hole provided in the bottom plate. By passing one end of the handle through the hole provided in the bottom plate,
The hole in the bottom plate can be used as a locking portion of the handle.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a drawer-type circuit breaker in which a locking portion is provided on the front side of a cradle and one end of a rod-shaped handle is provided when the bogie is pulled out on the front side of the cradle. And the handle is brought into contact with the trolley, the other end of the handle is moved toward the trolley with the fulcrum as a fulcrum, and the trolley is pushed into the depth side of the cradle and the shutter is retracted. It is what you get. Hereinafter, the present invention will be described based on examples.

[0015]

FIG. 1 is a partially broken side view showing the structure of a drawer-type circuit breaker according to Embodiment 1 of the present invention. The locking portion is a projection 21, which is provided on the bottom plate 1 </ b> A of the cradle 1. FIG. 2 is an enlarged perspective view of a main part of FIG. 1 and is an enlarged view of the vicinity of the left end of the bottom plate 1A of FIG. The protrusion 21 has a prismatic shape.

1 and 2 are the same as those of the conventional configuration, and the same portions are denoted by the same reference characters and will not be described in detail. FIG. 1 shows a fixed contact 5B and a movable contact 5A.
FIG. 4 is a configuration diagram in a case where the circuit breakers 4 are in a test state and are separated from each other. In this state, first, the rod-shaped handle 1
7 is locked by applying one end 17C to the right side of the protrusion 21 (locking portion). Next, the middle 17B of the handle 17 is brought into contact with the roller 7 of the carriage 2, and the handle 17 is rotated in the direction of arrow A by holding the other end 17A of the handle 17. Along with this, the protrusion 21 becomes a fulcrum, and the carriage 2 moves to the right. When the carriage 2 is pushed into the depth side of the cradle 1, the roller 15 is placed on the horizontal surface 14B of the operation piece 14 as described with reference to FIGS. 14 and 15, and the shutter 3 moves upward.

FIG. 3 is a partially broken side view after the handle 17 of FIG. 1 is rotated. The shutter 3 has moved upward. In this state, the draw-out circuit breaker has not yet been pushed into the operating state. However, since the shutter 3 has already been moved upward, the user can easily and manually push the shutter 3 to the position of the driving state. Therefore, in the operation of pushing in the drawer-type circuit breaker, conventionally, a large force was required when the shutter 3 was moved. However, the force was relieved by the principle of leverage, and the operation of pushing in became very easy.

[0018]

Second Embodiment FIG. 4 is a partially broken side view showing a configuration of a drawer-type circuit breaker according to a second embodiment of the present invention. The locking portion is a hole 23 provided in the shaped steel 22, and one end 17 </ b> C of the handle 17 is fitted in the hole 23. FIG.
FIG. 5 is an enlarged perspective view of a main part of FIG. 5, which is an enlarged view showing the vicinity of the left end of the bottom plate 1A in FIG. The hole 23 is a square hole.

The other parts of FIGS. 4 and 5 are the same as those of the first embodiment. FIG. 4 is a configuration diagram when the circuit breaker 4 is in a test state. In this state, first, one end 17C of the handle 17 is locked by fitting it into the hole 23 (locking portion). Next, the middle 17B of the handle 17
Is brought into contact with the roller 7 of the carriage 2, and the other end 17 </ b> A of the handle 17 is rotated in the direction of arrow A. Accordingly, the hole 23 becomes a fulcrum, and the carriage 2 moves to the right. When the carriage 2 is pushed into the depth side of the cradle 1, the roller 15 is placed on the horizontal surface 14B of the operation piece 14, and the shutter 3 moves upward.

FIG. 6 is a partially broken side view after the handle 17 of FIG. 4 is rotated. The shutter 3 has moved upward. In this state, the draw-out circuit breaker has not yet been pushed into the operating state. However, since the shutter 3 has already been moved upward, the user can easily and manually push the shutter 3 to the position of the driving state.

[0021]

Third Embodiment FIG. 7 is a partially broken side view showing a configuration of a drawer-type circuit breaker according to a third embodiment of the present invention. The locking portion is a hole 24 provided in the bottom plate 1A, and one end 17C of the handle 17 is fitted in the hole 24. FIG.
FIG. 8 is an enlarged perspective view of a main part of FIG. 8, which is an enlarged view showing the vicinity of the left end of the bottom plate 1A in FIG. The hole 24 is a square hole.

The other parts of FIGS. 7 and 8 are the same as those of the first embodiment. FIG. 7 is a configuration diagram when the circuit breaker 4 is in a test state. In this state, first, one end 17C of the handle 17 is locked by fitting it into the hole 24 (locking portion). The bottom of the hole 24 is closed by a plate (not shown). Next, the middle 17B of the handle 17 is brought into contact with the roller 7 of the cart 2, and
7 is rotated in the direction of arrow A with the other end 17A.
Accordingly, the hole 24 becomes a fulcrum, and the carriage 2 moves to the right. When the carriage 2 is pushed into the depth side of the cradle 1, the roller 15 is placed on the horizontal surface 14B of the operation piece 14, and the shutter 3 moves upward.

FIG. 9 is a partially broken side view after the handle 17 of FIG. 7 is rotated. The shutter 3 has moved upward. In this state, the draw-out circuit breaker has not yet been pushed into the operating state. However, since the shutter 3 has already been moved upward, the user can easily and manually push the shutter 3 to the position of the driving state. In addition to the first to third embodiments, generally, the shape of the locking portion and the attachment member may be arbitrary. That is, the locking portion does not necessarily have to be a prism or a square hole. The locking portion may be a semi-cylindrical column or a round hole, as long as one end of the handle is locked. Also,
The attachment member of the locking portion does not necessarily have to be a section steel for fixing the rail, but may be a section steel separately attached on the bottom plate. In short, it is sufficient that the locking portion is provided on the front side of the cradle and is at a position that can be a fulcrum.

[0024]

According to the present invention, as described above, the locking portion is provided on the front side of the cradle, and the one end of the rod-shaped handle is locked when the bogie is pulled out to the front side of the cradle. And the other end of the handle is moved toward the bogie with the locking portion as a fulcrum, and the bogie is pushed into the depth side of the cradle and the shutter is retracted. This makes it very easy to push the cart into the cradle, shortening the working time and alleviating operator fatigue.

[Brief description of the drawings]

FIG. 1 is a partially broken side view showing a configuration of a drawer-type circuit breaker according to a first embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part of FIG. 1;

FIG. 3 is a side view of a partially crushed state after turning a handle of FIG. 1;

FIG. 4 is a partially broken side view showing a configuration of a drawer-type circuit breaker according to a second embodiment of the present invention.

FIG. 5 is an enlarged perspective view of a main part of FIG. 4;

FIG. 6 is a partially broken side view after turning the handle of FIG. 4;

FIG. 7 is a partially broken side view showing a configuration of a drawer-type circuit breaker according to a third embodiment of the present invention.

FIG. 8 is an enlarged perspective view of a main part of FIG. 7;

9 is a partially broken side view after the handle 17 of FIG. 7 is rotated.

FIG. 10 is a front view showing a configuration of a conventional drawer-type circuit breaker.

FIG. 11 is a view taken in the direction of arrow B in FIG. 10;

FIG. 12 is an enlarged perspective view of a main part of FIG. 11;

FIG. 13 is a partially broken side view when the drawer-type circuit breaker of FIG. 11 is in operation.

FIG. 14 is a side view of a main part showing a shutter operation mechanism of the drawer-type circuit breaker of FIG. 11;

FIG. 15 is a side view of a main part when the shutter in FIG. 14 is moved upward;

[Explanation of symbols]

1: Cradle, 1A: Bottom plate, 2: Bogie, 3: Shutter, 4: Circuit breaker, 5A: Movable contact, 5B: Fixed contact, 10: Shaped steel, 17: Handle, 21: Projection (locking part) ), 23, 24: Hole (locking part)

Claims (4)

[Claims] A cradle for accommodating a circuit breaker is provided in a switchboard. The cradle has a horizontal bottom plate, is fixed to a main circuit in the switchboard, and is a shutter for closing the fixed contact. The circuit breaker has a movable contact and is mounted on a trolley, and the trolley is movable on the cradle bottom plate to the depth side and the near side, and the trolley is pulled out to the near side of the cradle. When the movable contact and the fixed contact are separated from each other, the shutter is interposed between the movable contact and the fixed contact, and when the bogie is pushed to the depth side of the cradle, the shutter retreats and moves. In the drawer-type circuit breaker in which the contact and the fixed contact are in conductive contact, a locking portion is provided on the near side of the cradle, and the bogie is in a state of being pulled out on the near side of the cradle. Then, one end of the rod-shaped handle is locked to the locking portion, and the middle of the handle is brought into contact with the bogie, the other end of the handle is moved to the bogie side with the locking portion as a fulcrum, A drawer-type circuit breaker characterized in that the shutter is retracted while being pushed into the depth side. 2. The drawer-type circuit breaker according to claim 1, wherein the locking portion is a projection provided on the bottom plate. 3. The drawer-type circuit breaker according to claim 1, wherein a shape steel is joined to the bottom plate, and the locking portion is a hole provided in the shape steel. 4. The drawer-type circuit breaker according to claim 1, wherein the locking portion is a hole provided in the bottom plate.