JP6936729B2 - How to assemble a circuit breaker and a circuit breaker - Google Patents

Description

The present invention relates to a circuit breaker such as a safety breaker and a method of assembling the circuit breaker.

As a conventional general safety breaker type circuit breaker, for example, there is a circuit breaker as described in Patent Document 1. Such a circuit breaker is assembled by placing the parts constituting the internal mechanism such as the terminal fittings in order on the lower case constituting the main body case, and finally fixing the upper case to the lower case. Be done.

Japanese Unexamined Patent Publication No. 2002-8512

In recent years, there has been a demand for a circuit breaker that employs a so-called quick-connect terminal as a terminal portion. However, if the quick-connect terminal is adopted, when assembling the circuit breaker, if the power supply side terminal side of the circuit breaker is the front side and the load side terminal side is the rear side, the quick-connect terminal fitting will be due to the structure of the quick-connect terminal. It is necessary to assemble from both the left and right sides. In addition, a release lever for releasing the electric wire connected to the quick-connect terminal fitting is also required, and the release lever can be assembled from both the left and right sides. Therefore, compared to the conventional circuit breakers that are mounted in a predetermined order from bottom to top, the release lever and quick-connect terminal fittings may easily fall off in the temporarily assembled state, and the assembly work is very complicated. The problem arises.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a circuit breaker that can be easily assembled and a method of assembling the circuit breaker, although the quick connection terminal is adopted. Is.

In order to achieve the above object, the invention according to claim 1 of the present invention has a power supply side terminal at the rear portion of the main body case in which the upper case and the lower case are assembled, and a quick-connect terminal fitting at the front portion. The load side terminals are arranged respectively, and the quick-connect terminal fitting, the load seat for holding the quick-connect terminal fitting, and the intermediate base provided with the mounting portions on both the left and right outer sides for mounting the load seat. A method of assembling a circuit breaker in which an intermediate unit having a release lever for pulling out an electric wire connected to the quick-connect terminal fitting is housed in a unit storage recess provided in the lower case. The load seats are placed on the above-mentioned mounting portions from the left and right outside of the intermediate base, and the quick-connecting terminal fittings are held by the respective load seats. The first step of assembling the intermediate unit from both the left and right outer sides to the intermediate base so as to cover from both outer sides and rotatably about the left and right directions, and the assembled intermediate unit in the unit storage recess. The second step of storing and sandwiching the intermediate unit between the left and right inner surfaces of the unit storage recess from the left and right outer sides of the left and right release levers, and the third step of assembling the upper case to the lower case are executed. It is characterized by.
Further, in order to achieve the above object, the invention according to claim 2 of the present invention has a power supply side terminal at the rear portion of the main body case in which the upper case and the lower case are assembled, and a quick-connect terminal fitting at the front portion. It is a circuit breaker in which load-side terminals having It is a member for pulling out an intermediate base provided with a portion and an electric wire connected to the quick-connecting terminal fitting, and rotates around the left-right direction so as to cover the quick-connecting terminal fitting from both the left and right outsides. An intermediate unit having release levers that can be assembled to the intermediate base from the left and right outside is provided, and a unit storage recess for accommodating the intermediate unit is provided in the lower case, and the intermediate unit is said to have the same. Along with the storage in the unit storage recess, the intermediate unit is sandwiched by the left and right inner surfaces of the unit storage recess from the left and right outer sides of the left and right release levers.
The invention according to claim 3 is the invention according to claim 2, wherein an operation window for exposing the operation portion of the release lever is provided at the front portion of the upper case, and the front end of the upper surface of the operation portion. It is characterized in that a rib that abuts on the front end of the operation window is provided at the initial position.

According to the present invention, a quick-connecting terminal fitting, a load seat for holding the quick-connecting terminal fitting, an intermediate base having mounting portions for mounting the load seats on both the left and right outer sides, and a quick-connecting terminal fitting are connected. It is a member for pulling out the electric wire, and has an intermediate with a release lever that covers the quick-connect terminal fitting from both the left and right outsides and is rotatably attached to the intermediate base from both the left and right outsides in the left-right direction. A unit is provided, and a unit storage recess for storing the intermediate unit is provided in the lower case. As the intermediate unit is stored in the unit storage recess, the intermediate unit is moved by the left and right inner surfaces of the unit storage recess to release the left and right levers. It was made to be sandwiched from the left and right outside. Therefore, the release lever and the quick-connect terminal fitting are hard to fall off in the temporarily assembled state, and the circuit breaker can be easily assembled.
Further, according to the invention of claim 3, an operation window for exposing the operation portion of the release lever is provided at the front portion of the upper case, and the operation window is provided at the front end of the upper surface of the operation portion at the initial position. A rib that contacts the front end is provided. Therefore, the intermediate unit in the temporarily assembled state can be held more reliably, and the assembly work can be further facilitated.

It is a perspective explanatory drawing which showed the circuit breaker. It is explanatory drawing which showed the circuit breaker from above. It is a perspective explanatory view which showed the state which disassembled the circuit breaker. It is a perspective explanatory view which showed the intermediate unit. It is explanatory drawing which showed the state which each member including the intermediate unit was housed in the lower case. It is explanatory drawing which showed the cross section of line AA in FIG. It is explanatory drawing which showed the BB line cross section in FIG.

Hereinafter, the circuit breaker according to the embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective explanatory view showing the circuit breaker 1. FIG. 2 is an explanatory view showing the circuit breaker 1 from above. FIG. 3 is a perspective explanatory view showing a state in which the circuit breaker 1 is disassembled. FIG. 4 is a perspective explanatory view showing the intermediate unit 11. FIG. 5 is an explanatory view showing a state in which each member including the intermediate unit 11 is housed in the lower case 3. FIG. 6 is an explanatory view showing a cross section taken along line AA in FIG. FIG. 7 is an explanatory view showing a cross section taken along line BB in FIG.

The circuit breaker 1 has a main body case 4 formed by assembling an upper case 2 and a lower case 3, and a power supply side terminal 5 in which two terminals are arranged side by side is provided at the rear portion of the main body case 4. Have been placed. Each terminal in the power supply side terminal 5 can be screwed into a square box-shaped terminal fitting 6 into which an electric wire can be inserted and a square box-shaped terminal fitting 6, so that the electric wire and the square box-shaped terminal fitting 6 are electrically connected. The terminal screw 7 and the terminal seat 8 extending forward from the square box-shaped terminal fitting 6 are provided. A fixed contact 9 is provided on the upper surface of the front end of each terminal seat 8. On the other hand, on the front part of the main body case 4, a load side terminal in which two terminals are arranged side by side is arranged. Inside the main body case 4, an intermediate unit 11 for holding the quick-connect terminal fittings 10 and 10 constituting the load-side terminal is installed on the front side of the fixed contacts 9 and 9.

The intermediate unit 11 includes an intermediate base 12 as a base on which various parts are assembled, electric wire fittings 13 and 13 held by the intermediate base 12, and quick-connect terminal fittings 10 held by the electric wire fittings 13 and 13. It has 10 and release levers 14 and 14 for pulling out electric wires from the quick-connect terminal fittings 10 and 10. The intermediate base 12 is formed by fixing fan-shaped plates 15 and 15 having a quarter circle on the left and right sides of the base, and electric circuit metal fittings 13 can be placed on the left and right outer surfaces of each plate 15. The mounting portion 16 is projected on the left and right outside. Further, on the front side of each plate body 15, at a position below the mounting portion 16, a shaft support recess 17 for axially supporting the release lever 14 with the left-right direction as the axial direction is provided. .. Further, on the upper side of the mounting portion 16 in each plate body 15, a sliding surface 18a of the release lever 14 that curves downward toward the rear side is provided. In addition, on the rear side of the mounting portion 16 in each plate body 15, the sliding surface 18b of the release lever 14 whose rear surface curves downward toward the rear side is formed, and the lower end portion of the rear surface is movable, which will be described later. The block portion 20 serving as a fulcrum of the metal fitting 19 is projected to the left and right outside. Reference numeral 38 denotes an insertion portion for allowing the electroscope device to come into contact with the upper surface of the load seat 21, which will be described later, from the outside of the main body case 4, and is formed as a recess recessed inward in the left-right direction.

Further, the electric wire metal fitting 13 includes a load seat 21 mounted on the mounting portion 16, a band-shaped movable metal fitting 19 extending in the front-rear direction, and a flexible electric wire 22 for electrically connecting the load seat 21 and the movable metal fitting 19. have. The load seat 21 is a metal fitting for holding the quick-connect terminal metal fitting 10, a portion that covers the lower side of the quick-connection terminal metal fitting 10, a portion that covers the inside of the quick-connection terminal metal fitting 10 in the left-right direction, and a quick-connection terminal. It is bent in a U-shape in front view, which integrally has a portion covering the upper side of the metal fitting 10. In addition, the rear portion of the load seat 21 is provided with a blocking wall 23 for blocking the movement of the quick-connect terminal fitting 10 to the rear side. On the other hand, the movable metal fitting 19 is provided with a movable contact 24 on the lower surface of the rear end, and is located at a position substantially centered in the front-rear direction when the movable contact 24 is connected / dissociated from the fixed contact 9. The shaft portions 19a and 19a are provided.

Further, the release lever 14 has a plate-shaped cover portion 25 extending in the vertical direction, and an operation portion 26 for operating the release lever 14 is provided at the upper end of the cover portion 25. The operation unit 26 is formed in a band shape extending in the front-rear direction and projects inward in the left-right direction, and its lower surface is an arc-shaped curved surface slidable on the sliding surfaces 18a and 18b. Further, a rib 28 projecting upward is provided on the upper surface of the front end of the operation unit 26. Further, at the lower end of the cover portion 25, a rotating shaft portion 27 for rotatably holding the release lever 14 about the left-right direction is provided so as to project inward in the left-right direction. Further, a working portion 29 is provided at a substantially central portion of the cover portion 25 in the vertical direction so as to project inward in the horizontal direction and for pressing and deforming the quick-connect terminal fitting 10 when the release lever 14 is operated. There is. In addition, the operation unit 26 is provided with an insertion hole 39 into which a voltage detection instrument can be inserted. When the release lever 14 is in the initial position, the insertion hole 39 is located above the insertion portion 38, and the upper surface of the load seat 21 is exposed to the upper case 2 side.

In order to assemble the intermediate unit 11 having the intermediate base 12, the electric circuit fitting 13, the quick connecting terminal fitting 10 and the release lever 14 as described above, first, the intermediate base 12 is mounted on the mounting portions 16 and 16 from the left and right outside. The load seats 21 and 21 are placed, and the electric circuit metal fittings 13 and 13 are assembled. Next, the quick connection terminal fittings 10 are installed from the left and right outside in the load seat 21 of each electric circuit fitting 13. Further, the rotating shaft portion 27 may be inserted into the shaft support recess 17 from the left and right outside with respect to the intermediate base 12, and the release levers 14 and 14 may be assembled. In the assembled state, each quick-connect terminal fitting 10 is held by the intermediate base 12 in a shape surrounded by the cover portion 25 of the load seat 21 and the release lever 14.

On the other hand, the lower case 3 is a box body that opens upward, and is connected to a storage portion for storing parts constituting the power supply side terminal 5 such as a square box-shaped terminal fitting 6, and a handle 30 that can be rotated in the front-rear direction. It is provided with a storage unit for storing the shut-off mechanism 31 and a unit storage recess 32 for storing the lower part of the intermediate unit 11. Further, coil springs 33 and 33 that urge the movable metal fitting 19 toward the side where the movable contact 24 dissociates from the fixed contact 9 can be attached to the lower case 3. Further, on the rear surface of the lower case 3, electric wire holes 34, 34 for inserting electric wires into the square box-shaped terminal metal fittings 6, 6 are provided.

Further, the upper case 2 is a box body that opens downward, and terminal windows 35, 35 for exposing the terminal screws 7 and 7 are provided at the rear portion. Further, a handle window 36 for exposing the handle 30 is provided in the substantially central portion of the upper case 2 in the front-rear direction, and the operation portions 26, 26 are exposed in the front portion of the upper case 2. The operation windows 37 and 37 of the above are opened. In addition, two entry holes (not shown) for inserting the electric wire into the quick-connect terminal fitting 10 side are provided on the front surface of the upper case 2.

Then, when assembling the circuit breaker 1, parts constituting the power supply side terminal 5 such as the square box-shaped terminal fitting 6 and the coil springs 33 and 33 are attached to the lower case 3. Next, after assembling the intermediate unit 11 as described above, the movable metal fittings 19 and 19 are rotatably assembled to the lower case 3 while being stored in the unit storage recess 32. In this assembled state, the movable metal fittings 19 and 19 are located below the block portions 20 and 20 and are urged upward by the coil springs 33 and 33. Further, the movable metal fittings 19 and 19 pass under the block portions 20 and 20 and project to the front of the intermediate base 12, and the upper surfaces of the movable metal fittings 19 and 19 abut on the block portions 20 and 20 so that the movable metal fittings 19 and 19 come into contact with the block portions 20 and 20. It is designed to function as a fulcrum during the operation of. Further, as the intermediate unit 11 is stored in the unit storage recess 32, the cover portions 25 and 25 of the left and right release levers 14 and 14 of the intermediate unit 11 in the temporarily assembled state are the left and right inner surfaces 32a and 32a of the unit storage recess 32. Therefore, it is sandwiched from the left and right outside and temporarily held.

Then, after storing the blocking mechanism 31, the upper case 2 is assembled to the lower case 3. As the upper case 2 is assembled to the lower case 3, the handle 30 projects upward from the upper case 2 through the handle window 36. Further, the operation portions 26 and 26 of the release levers 14 and 14 are located in the operation windows 37 and 37, and the ribs 28 and 28 of the release levers 14 and 14 at the initial positions due to the urging force of the quick connecting terminal fittings 10 and 10 are located. Is in a state of riding on the front edges of the operation windows 37 and 37, and the temporarily assembled state of the intermediate unit 11 is further stabilized. Finally, if both cases 2 and 3 are screwed together, the assembly of the circuit breaker 1 is completed. When the operation portions 26, 26 of the release levers 14, 14 are located in the operation windows 37, 37 as the upper case 2 is assembled to the lower case 3, the outer surface of the release levers 14, 14 and the unit storage recess 32 The left and right inner surfaces 32a and 32a are slightly separated from each other so as not to interfere with the rotation operation of the release levers 14 and 14.

According to the circuit breaker 1 having the above configuration, the quick-connecting terminal fittings 10 and 10 and the electric circuit fittings 13 and 13 having the load seat 21 for holding the quick-connecting terminal fittings 10 and the left and right outer sides are loaded. It is a member for pulling out the electric wire connected to the intermediate base 12 provided with the mounting portions 16 and 16 on which the seat 21 is mounted and the quick-connecting terminal fitting 10, and the quick-connecting terminal fittings 10 and 10 are placed on both the left and right outside. An intermediate unit 11 having release levers 14 and 14 that can be assembled to the intermediate base 12 from both the left and right outsides so as to cover the intermediate base 12 and rotatably around the left-right direction is provided, and the intermediate unit 11 is provided in the lower case 3. A unit storage recess 32 for storing is provided, and as the intermediate unit 11 is stored in the unit storage recess 32, the intermediate unit 11 moves from the left and right inner surfaces 32a and 32a of the unit storage recess 32 to the left and right release levers 14 and 14. Furthermore, it was made to be sandwiched from the left and right outside. Therefore, the release levers 14 and 14 and the quick-connect terminal fittings 10 and 10 are unlikely to fall off in the temporarily assembled state, and the circuit breaker 1 can be easily assembled.

Further, an operation window 37, 37 for exposing the operation units 26, 26 of the release levers 14, 14 is provided at the front portion of the upper case 2, and an operation window 37, 37 is provided at the front end of the upper surface of each operation unit 26 at the initial position. A rib 28 that comes into contact with the front end of the 37 is provided. Therefore, the intermediate unit 11 in the temporarily assembled state can be held more reliably, and the assembly work of the circuit breaker 1 can be further facilitated.

The method of assembling the circuit breaker and the circuit breaker according to the present invention is not limited to the embodiment of the above embodiment, and the configuration of the intermediate unit, the release lever, etc. does not deviate from the gist of the present invention. Then, it can be changed as needed.

For example, in the above embodiment, the power supply side terminal is configured as a conventionally known terminal having a square box-shaped terminal fitting, but it can also be configured as a terminal having another structure such as a plug-in type terminal. ..
Further, the design can be appropriately changed as to whether or not the release lever is provided with the rib and whether or not the insertion hole is provided.

1 ... Circuit breaker, 2 ... Upper case, 3 ... Lower case, 4 ... Main body case, 5 ... Power supply side terminal, 10 ... Quick connection terminal bracket, 11 ... Intermediate unit, 12 ... Intermediate Base, 13 ... Electric circuit metal fittings, 14 ... Release lever, 16 ... Mounting part, 25 ... Cover part, 26 ... Operation part, 27 ... Rotating shaft part, 28 ... Rib, 32 ... Unit storage recess, 32a ... inner surface, 37 ... operation window.

Claims (3)

The power supply side terminal is arranged at the rear part of the main body case in which the upper case and the lower case are assembled, and the load side terminal having the quick connection terminal metal fitting is arranged at the front part. It has a load seat for holding the terminal fittings, an intermediate base having mounting portions for mounting the load seats on both the left and right outer sides, and a release lever for pulling out the electric wire connected to the quick-connect terminal fitting. A method of assembling a circuit breaker in which the intermediate unit is housed in the unit storage recess provided in the lower case.
The load seats are placed on the above-mentioned mounting portions from the left and right outer sides of the intermediate base, and the quick-connecting terminal fittings are held by the respective load seats. The first step of assembling the intermediate unit by assembling the intermediate base from the left and right outer sides so as to cover from both outer sides and rotatably about the left and right directions.
A second step of storing the assembled intermediate unit in the unit storage recess and sandwiching the intermediate unit between the left and right outer surfaces of the left and right release levers on the left and right inner surfaces of the unit storage recess.
A method for assembling a circuit breaker, which comprises executing a third step of assembling the upper case to the lower case. It is a circuit breaker in which the power supply side terminal is arranged at the rear part of the main body case in which the upper case and the lower case are assembled, and the load side terminal having the quick connection terminal metal fitting is arranged at the front part.
It is connected to the quick-connecting terminal fitting, a load seat for holding the quick-connecting terminal fitting, an intermediate base having mounting portions for mounting the load seat on both the left and right outer sides, and the quick-connecting terminal fitting. An intermediate member for pulling out an electric wire, which has a release lever that covers the quick-connecting terminal fitting from both the left and right outer sides and is rotatably attached to the intermediate base from the left and right outer sides so as to be rotatable around the left and right directions. As well as having a unit
The lower case is provided with a unit storage recess for storing the intermediate unit, and as the intermediate unit is stored in the unit storage recess, the intermediate unit is moved to the left and right by the left and right inner surfaces of the unit storage recess. A circuit breaker characterized in that it is further sandwiched from the left and right outside of the release lever. An operation window that exposes the operation portion of the release lever is provided at the front portion of the upper case, and a rib that contacts the front end of the operation window at an initial position is provided at the front end of the upper surface of the operation portion. The circuit breaker according to claim 2, wherein the circuit breaker is provided.

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