Ground barrier

Abstract

To improve the ease of disconnection of an earthing barrier and enable its use on a load side as well.SOLUTION: An earthing barrier 21 includes a barrier plate 22 and a lever part 24. The barrier plate 22 is provided along a mounting surface of a circuit breaker 11. The lever part 24 protrudes from the barrier plate 22, and a claw 26 formed at the tip fits into the circuit breaker 11.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to an earth barrier. [Background technology]

[0002] Patent Document 1 describes an earth barrier that is attached to the mounting surface of a circuit breaker to strengthen the earth insulation around the wiring. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 4-64906 Summary of the Invention [Problem to be solved by the invention]

[0004] Since earth barriers are generally constructed so that they are simply inserted into the circuit breaker, they are prone to coming loose and cannot be used on the load side, where they are inserted from below. An object of the present invention is to improve the ease of removal of a ground barrier and to enable its use on the load side. [Means for solving the problem]

[0005] The ground barrier according to one aspect of the present invention includes a barrier plate and a lever portion. The barrier plate is provided along a mounting surface of a circuit breaker. The lever portion protrudes from the barrier plate and has a claw formed at a tip thereof that fits into the circuit breaker. Effect of the Invention

[0006] According to the present invention, the claw of the lever portion fits into the circuit breaker, making it difficult to come off. Therefore, it can be used on the load side, which is inserted from below. [Brief description of the drawings]

[0007] [Figure 1]FIG. 2 shows a ground barrier. [Diagram 2] FIG. [Diagram 3] FIG. 4 is a diagram showing a protrusion of a circuit breaker. [Figure 4] FIG. 2 shows a ground barrier. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 13 is a diagram showing a state before installation in a comparative example. [Figure 10] FIG. 13 is a diagram showing a state after installation in a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that each drawing is a schematic view and may differ from the actual one. In addition, the following embodiment illustrates an apparatus and method for embodying the technical idea of ​​the present invention, and does not specify the configuration as described below. In other words, the technical idea of ​​the present invention can be modified in various ways within the technical scope described in the claims.

[0009] <<Embodiment>> "composition" In the following description, the three mutually orthogonal directions are referred to as a vertical direction, a width direction, and a depth direction for the sake of convenience. FIG. 1 is a diagram showing a circuit breaker 11. FIG. 1(a) shows the circuit breaker 11 as viewed from one side in the vertical direction, one side in the width direction, and from the front in the depth direction. FIG. 1(b) shows the circuit breaker 11 as viewed from one side in the width direction. The circuit breaker 11 is attached to a mounting surface 12 that runs along the vertical and width directions. The circuit breaker 11 has three poles, and an extension bar is connected to each terminal 13. Here, as an example, an electric wire 14 is connected only to the power supply side. An earth barrier 21 is attached to the circuit breaker 11 as an accessory. The earth barrier 21 is attached to the rear side of the terminal 13 of the housing of the circuit breaker 11, and is provided along the mounting surface 12 to strengthen the earth insulation around the wiring.

[0010] FIG. 2 is a diagram showing the rear surface of the circuit breaker 11. As shown in FIG. Here, the circuit breaker 11 is shown as seen from one side in the vertical direction, the other side in the width direction, and the back in the depth direction. The resin housing of the circuit breaker 11 has a protrusion 16 formed on the back side of the terminal 13. The circuit breaker 11 is of a general front type, in which wiring is connected from the front side. In a back type, in which wiring is connected from the back side, the protrusion 16 is removed, a stud is attached to the terminal 13, and wiring is connected to the stud protruding from the back side. In this embodiment, an earth barrier 21 is attached to the protrusion 16, so that the wiring connection method is limited to the circuit breaker 11 of the front type.

[0011] FIG. 3 is a diagram showing the protruding portion 16 of the circuit breaker 11. As shown in FIG. FIG. 1A shows the protruding portion 16 of the circuit breaker 11 as viewed from one side in the vertical direction, the other side in the width direction, and the back in the depth direction. FIG. 1B shows the protruding portion 16 of the circuit breaker 11 as viewed from one side in the vertical direction. A concave surface 18 is formed on the rear surface of the housing of the circuit breaker 11, which is concave by the thickness of the earth barrier 21 toward the front side in the depth direction from the mounting surface 17. The mounting surface 17 and the concave surface 18 are both flat surfaces along the vertical direction and the width direction. The protruding portion 16 is convex toward the back side in the depth direction from the concave surface 18, and the tip surface is approximately flush with the mounting surface 17 and is set so as not to protrude beyond the mounting surface 17. The protruding portion 16 is a regular hexagonal prism, and two opposing sides on both sides in the width direction are formed along the vertical direction.

[0012] FIG. 4 is a diagram showing the ground barrier 21. As shown in FIG. FIG. 1A shows the ground barrier 21 as viewed from one side in the vertical direction, one side in the width direction, and from the front in the depth direction. The ground barrier 21 is made of insulating resin, is formed in a flat plate shape along the vertical and width directions, and includes a barrier plate 22, a base 23, a lever portion 24, and a positioning portion 25. The barrier plate 22 is slightly wider than the circuit breaker 11. FIG. 1B shows the periphery of the base 23 as viewed from the front in the depth direction. The base 23 protrudes from the barrier plate 22 in the vertical direction toward the inner side, i.e., toward the circuit breaker 11 side, for each protrusion 16. The base 23 has a width dimension larger than the protrusion 16, and the tip side is formed in a V-shape that is concave toward the outer side in the vertical direction, i.e., toward the opposite side of the circuit breaker 11, so that two sides of the protrusion 16 fit together.

[0013] The base 23 at one end in the width direction is formed with a lever portion 24 that protrudes from the other end in the width direction toward the inside in the vertical direction and fits into the protrusion 16, and a positioning portion 25 that protrudes from one end in the width direction toward the inside in the vertical direction and is adjacent to the protrusion 16 is formed. The base 23 at the other end in the width direction is formed with a lever portion 24 that protrudes from one end in the width direction toward the inside in the vertical direction and fits into the protrusion 16, and a positioning portion 25 that protrudes from the other end in the width direction toward the inside in the vertical direction and is adjacent to the protrusion 16 is formed. The base 23 at the center in the width direction is formed with a pair of lever portions 24 that protrude from both one end and the other end in the width direction toward the inside in the vertical direction and fit into the protrusion 16. The lever portion 24 is formed to have a smaller dimension in the width direction than the positioning portion 25, so that elastic deformation in the width direction is allowed. A claw 26 that protrudes toward the inside is formed at the tip of the lever portion 24. The protrusions 16 fit into the area surrounded by the base portion 23, the lever portions 24, and the positioning portions 25, and the area surrounded by the base portion 23 and the pair of lever portions 24.

[0014] A slit 27 is formed in the base 23. The slit 27 extends linearly from the tip to the base end of the base 23 along the vertical direction at the center in the width direction of the base 23 and at the apex of the interior angle where the protrusions 16 fit together. The slit 27 allows elastic deformation of the lever portion 24 in the width direction. An insertion line 31 and a block arrow 32 are formed on the surface of the barrier plate 22 on the inside in the vertical direction. The insertion line 31 is a linear groove along the width direction that is concave in the thickness direction, and is a mark that indicates how far the lever portion 24 should be inserted into the back side of the circuit breaker 11 so that it fits into the protrusion 16. The block arrow 32 is concave in the thickness direction by embossing, and is a symbol that indicates the insertion direction of the earth barrier 21 and points to the insertion line 31 on the inside in the vertical direction. It indicates that the lever portion 24 fits into the protrusion 16 when the earth barrier 21 is inserted into the back side of the circuit breaker 11 and the insertion line 31 reaches one or the other end of the circuit breaker 11 in the vertical direction.

[0015] Next, the installation of the ground barrier 21 will be described. FIG. 5 is a diagram showing the state before mounting. Here, the circuit breaker 11 and the ground barrier 21 are shown as viewed from one side in the vertical direction, the other side in the width direction, and from the rear in the depth direction. The ground barrier 21 is inserted behind the circuit breaker 11. FIG. 6 shows the state after installation. Here, the circuit breaker 11 and the ground barrier 21 are shown as viewed from one side in the vertical direction, the other side in the width direction, and from the rear in the depth direction. Although not shown in the figures, it is assumed that the circuit breaker 11 is attached to the mounting surface 12. The ground barrier 21 is inserted along the mounting surface 12, so it will not fall backwards in the depth direction or become detached (see FIG. 1(b)).

[0016] FIG. 7 is a diagram showing the front side after installation. Here, the circuit breaker 11 and the ground barrier 21 are shown as viewed from one side in the vertical direction, one side in the width direction, and from the front in the depth direction. It shows that the lever portion 24 fits into the protrusion 16 when the ground barrier 21 is inserted behind the circuit breaker 11 and the insertion line 31 reaches one end or the other end of the circuit breaker 11 in the vertical direction. FIG. 8 is a diagram showing the back side after installation. FIG. 1A shows the protrusion 16 as viewed from one side in the vertical direction, the other side in the width direction, and from the rear in the depth direction. FIG. 1B shows the protrusion 16 as viewed from the rear in the depth direction. The protrusion 16 fits into the area surrounded by the base 23, the lever portion 24, and the positioning portion 25, and the area surrounded by the base 23 and the pair of lever portions 24. At this time, the surface of the base 23 is in surface contact with the concave surface 18. The lever portion 24 is allowed to elastically deform in the width direction, so that it fits into the protrusion 16 as a snap fit. On the other hand, the positioning portion 25 is not allowed to elastically deform in the width direction, so that its position in the width direction on the ground barrier 21 is fixed.

[0017] <Action and Effect> Next, main effects of the embodiment will be described. The ground barrier 21 comprises a barrier plate 22 and a lever portion 24. The barrier plate 22 is provided along the mounting surface of the circuit breaker 11. The lever portion 24 protrudes from the barrier plate 22, and a claw 26 formed at the tip thereof fits into the circuit breaker 11. In this way, the claw 26 of the lever portion 24 fits into the circuit breaker 11, making it difficult for it to come off. Therefore, it can also be used on the load side where it is inserted from below.

[0018] The claw 26 of the lever portion 24 fits into a protrusion 16 formed on the rear side of the terminal 13 in the resin housing of the circuit breaker 11. Since the ground barrier 21 can be fixed by utilizing the existing protrusion 16, an increase in costs can be suppressed. The ground barrier 21 has a base 23 protruding from a barrier plate 22 for each terminal 13. The lever portion 24 protrudes from at least one of one end and the other end in the width direction of the base 23. This allows the lever portion 24 to be fitted together at multiple points, improving the attachment strength.

[0019] A slit 27 is formed in base portion 23, which extends from the tip end to the base end at the center in the width direction and allows elastic deformation in the width direction of lever portion 24. This allows lever portion 24 to be smoothly fitted into protrusion 16 like a snap fit. A lever portion 24 protruding from the other end in the width direction and engaging with the protrusion 16 is formed on the base portion 23 at one end in the width direction, and a positioning portion 25 protruding from one end in the width direction and adjacent to the protrusion 16 is formed on the base portion 23 at the other end in the width direction. A lever portion 24 protruding from one end in the width direction and engaging with the protrusion 16 is formed on the base portion 23 at the other end in the width direction, and a positioning portion 25 protruding from the other end in the width direction and adjacent to the protrusion 16 is formed on the base portion 23 at the other end in the width direction. This allows the pair of positioning portions 25 located at both ends in the width direction to suppress rattling in the width direction of the ground barrier 21 and to be firmly fixed.

[0020] The base 23, which is located at a position other than both ends in the width direction, is formed with lever portions 24 that protrude from both ends in the width direction and fit into the protrusions 16. This allows the pair of lever portions 24 to cancel out the reaction forces generated when the earth barrier 21 is elastically deformed, and makes it possible to stabilize the posture and width direction position of the earth barrier 21 when it is inserted behind the circuit breaker 11. The lever portion 24 is formed thinner than the positioning portion 25. This allows elastic deformation in the width direction of the lever portion 24, allowing them to be fitted together smoothly like a snap fit. Furthermore, by suppressing elastic deformation in the width direction of the positioning portion 25, rattling in the width direction of the ground barrier 21 can be suppressed, and it can be firmly fixed.

[0021] An insertion line 31 and a block arrow 32 are provided on the surface of the barrier plate 22, which indicate how far the lever portion 24 must be inserted into the rear side of the circuit breaker 11 until it fits into the protrusion 16. This allows visual confirmation from the front side that the lever portion 24 has fitted into the protrusion 16. The circuit breaker 11 has a surface-type wiring connection system, which allows the earth barrier 21 to be fixed using the existing protrusion 16, thereby suppressing increases in costs. The protrusion 16 is shaped like a hexagonal column, with two opposing sides on both sides in the width direction formed along the insertion direction. This allows the claw 26 of the lever portion 24 to be smoothly guided along the sides of the protrusion 16.

[0022] Next, a comparative example will be described. In the comparative example, a structure in which an earth barrier is simply inserted into the back side of a circuit breaker will be described. FIG. 9 is a diagram showing a state before mounting in a comparative example. Here, the circuit breaker 41 and the ground barrier 42 are shown as viewed from one side in the vertical direction, the other side in the width direction, and from the rear in the depth direction. The ground barrier 42 is inserted behind the circuit breaker 41. FIG. 10 is a diagram showing a state after mounting in a comparative example. Here, the circuit breaker 41 and the ground barrier 42 are shown as viewed from one side in the vertical direction, the other side in the width direction, and from the back in the depth direction. The ground barrier 42 is simply inserted into the back side of the circuit breaker 41, so it is easy to come off, and cannot be used on the load side, where it is inserted from below.

[0023] <<Variation>> In the embodiment, the circuit breaker 11 having three poles has been described, but the present invention is not limited to this. It may also be applied to a circuit breaker having two or four poles. In the case of a circuit breaker having two poles, one lever portion 24 and one positioning portion 25 are formed on each of the bases 23. In the case of a circuit breaker having four poles, one lever portion 24 and one positioning portion 25 are formed on each of the bases 23 at both ends in the width direction, and a pair of lever portions 24 are formed on the bases 23 excluding both ends in the width direction.

[0024] Although the above description has been given with reference to a limited number of embodiments, the scope of the invention is not limited thereto, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art. [Explanation of symbols]

[0025] 11...circuit breaker, 12...mounting surface, 13...terminal, 14...electric wire, 16...convex portion, 17...mounting surface, 18...concave surface, 21...earth barrier, 22...barrier plate, 23...base, 24...lever portion, 25...positioning portion, 26...claw, 27...slit, 31...insertion line, 32...block arrow, 41...circuit breaker, 42...earth barrier

Claims

1. a barrier plate provided along a mounting surface of the circuit breaker; a lever portion protruding from the barrier plate and having a claw formed at a tip thereof that fits into the circuit breaker.

2. 2. The earth barrier according to claim 1, wherein the claw of the lever portion fits into a protrusion formed on a rear side of a terminal of a resin housing of the circuit breaker.

3. Each of the terminals has a base portion protruding from the barrier plate, 3. The ground barrier according to claim 2, wherein the lever portion protrudes from at least one of one end and the other end in the width direction of the base portion.

4. 4. The ground barrier according to claim 3, wherein a slit is formed in the base portion at the center in the width direction, extending from the tip end to the base end, and allowing elastic deformation in the width direction of the lever portion.

5. The base portion at one end in the width direction is formed with the lever portion protruding from the other end in the width direction and engaging with the protruding portion, and a positioning portion is formed protruding from the other end in the width direction and adjacent to the protruding portion, 4. The ground barrier according to claim 3, characterized in that the base portion at the other end in the width direction is formed with the lever portion protruding from one end in the width direction and engaging with the convex portion, and a positioning portion protruding from the other end in the width direction and adjacent to the convex portion.

6. 4. The ground barrier according to claim 3, characterized in that the base portion, located at a position other than both ends in the width direction, is formed with a lever portion protruding from both one end and the other end in the width direction and engaging with the convex portion.

7. 6. The ground barrier according to claim 5, wherein the lever portion is thinner than the positioning portion.

8. 3. The earth barrier according to claim 2, wherein a mark is provided on a surface of the barrier plate to indicate how far the lever portion needs to be inserted into the rear side of the circuit breaker so that the lever portion fits into the protrusion.

9. 2. The earth barrier according to claim 1, wherein the circuit breaker has a surface-type wiring connection.

10. 3. The ground barrier according to claim 2, wherein the protrusion is a hexagonal column, and two opposing sides on both sides in the width direction are formed along the insertion direction.

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