Wiring connection fixture

Abstract

To enable a wiring connection fixture for being fitted to electric equipment, to be fitted to a plurality of models.SOLUTION: A conductive plate 21 is inserted into a screw terminal 12 of electric equipment 11 to be fixed. A case 22 holds the conductive plate 21. A cover 23 covers the case 22 and is formed with electric wire insertion holes 51. Leaf springs 24 are held in the case 22. The leaf springs 24 press electric wires 61 inserted into the electric wire insertion holes 51, respectively, against the conductive plate 21. A wiring connection fixture 13 is fitted to the electric equipment 11 independently for each pole.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a wiring connection device. [Background technology]

[0002] Patent Document 1 discloses a structure in which a connector is added to the screw terminal of an electrical device to improve the efficiency of the connection work, and the leaf spring of the connector enables connection by simply inserting an electric wire. The connector has three leaf springs assembled into one unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-004496 A Summary of the Invention [Problem to be solved by the invention]

[0004] Because the housing structure and screw terminal pitch of each model of electrical equipment differ, a connector with multiple poles integrated into one device must be designed for each model of electrical equipment, resulting in increased costs. SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a wiring connection device that can be attached to electrical equipment and that can be attached to a plurality of models. [Means for solving the problem]

[0005] A wiring connection device according to one aspect of the present invention includes a conductive plate, a case, a cover, and a leaf spring. The conductive plate is inserted into and fixed to a screw terminal of an electrical device. The case holds the conductive plate. The cover covers the case and has an electric wire insertion hole formed therein. The leaf spring is held by the case and presses an electric wire inserted into the electric wire insertion hole against the conductive plate. The wiring connection device is independently attached to the electrical device for each pole. Effect of the Invention

[0006] According to the present invention, the wiring connection device is attached to the electric device for each pole independently, so that it can be attached to a plurality of models of electric devices if the screw terminals have the same diameter. [Brief description of the drawings]

[0007] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. 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 will be referred to as a width direction, a length direction, and a depth direction for the sake of convenience. FIG. 1 is a diagram showing an electric device 11. As shown in FIG. Here, the electrical device 11 is shown as seen from the front in the depth direction. The electrical device 11 is, for example, an electromagnetic contactor, and is provided with screw terminals 12 for the main circuit. Specifically, three screw terminals 12 lined up in the width direction are provided on one side of the vertical direction, which is the power supply side, and three screw terminals 12 lined up in the width direction are provided on the other side of the vertical direction, which is the load side. The screw terminals 12 have square washers built in to hold the wires in place.

[0010] In the embodiment, a configuration for attaching the wiring connection device 13 to the screw terminal 12 of the main circuit will be described. In the following description, in the vertical direction, the side closer to the electric device 11 is defined as the inside, and the side farther from the electric device 11 is defined as the outside. FIG. 2 is a diagram showing the wiring connection device 13. As shown in FIG. FIG. 1(a) shows the wiring connection device 13 as viewed from one side in the width direction, from the outside in the vertical direction, and from the front in the depth direction. FIG. 1(b) shows a cross section of the wiring connection device 13, taken along the vertical and depth directions and passing through the center in the width direction, as viewed from one side in the width direction. The wiring connection device 13 is attached independently to the electric device 11 for each pole, and includes a conductive plate 21, a case 22, a cover 23, and a leaf spring 24.

[0011] FIG. 3 is a diagram showing the conductive plate 21. As shown in FIG. (a) in the figure shows the conductive plate 21 as viewed from one side in the width direction, from the outside in the vertical direction, and from the front in the depth direction. (b) in the figure shows the conductive plate 21 as viewed from the front in the depth direction. (c) in the figure shows the conductive plate 21 as viewed from one side in the width direction. The conductive plate 21 is made of a conductive metal, and includes a substrate 31 and a bonding plate 32. The substrate 31 is a plate extending in the vertical direction and aligned in the vertical and width directions, and the outer side in the vertical direction is displaced in the depth direction through a Z-bent step. The other end of the substrate 31, which is the outer side in the vertical direction, is formed with a receiving plate 33 that is bent at a right angle in the L direction and rises toward the front in the depth direction and aligned in the depth and width directions. The substrate 31 is formed with a terminal plate 35 on one end, which is the inner side in the vertical direction. The terminal plate 35 is widened to match the width dimension of the square washer of the screw terminal 12, and its outline viewed from the depth direction is a square with four corners. The terminal plate 35 is formed with a round hole through which the screw terminal 12 can be inserted.

[0012] The joining plate 32 is a plate extending in the vertical direction and aligned in the vertical and width directions, and one end side, which is the inside in the vertical direction, is bent at a right angle to rise up in the depth direction. The other end side, which is the outside in the vertical direction, is bent at a right angle to form a support plate 34 which rises up in the depth direction and aligned in the depth and width directions. The joining plate 32 is joined to the substrate 31 so that the support plate 34 is located vertically inside the Z-bend step in the substrate 31. Here, as an example, the joining is performed by brazing, but the present invention is not limited to this, and the joining may be performed by fastening using bolts, nuts, screws, or the like, or by caulking.

[0013] FIG. 4 is a diagram showing the case 22. FIG. 1A shows the case 22 as viewed from one side in the width direction, the outside in the vertical direction, and the front side in the depth direction. FIG. 1B shows the case 22 as viewed from one side in the width direction. The case 22 is made of insulating resin, and is closed on the other side in the width direction, both sides in the vertical direction, and the back in the depth direction, and is open on one side in the width direction and the front side in the depth direction. The back wall of the case 22 in the depth direction is displaced to the back in the depth direction via a step on the outside in the vertical direction. The inner wall of the case 22 in the vertical direction is formed with an opening 41 that opens in the vertical direction and is open on one side in the width direction. The width and depth dimensions of the opening 41 correspond to the width and depth dimensions of the conductive plate 21. The conductive plate 21 is fitted into the case 22 from one side in the width direction, and is held in the case 22 with one end side that is the inside in the vertical direction protruding from the opening 41. Two internal partitions 42 are formed on the inner peripheral surface of the other wall in the width direction of the case 22. The internal partition 42 is formed so as to protrude to one side in the width direction, and is formed into a substantially right-angled triangle as viewed in the width direction by a side along the vertical direction, a side along the depth direction, and a hypotenuse that extends further in the depth direction as it extends outward in the vertical direction. A protrusion 43 is formed on the outer peripheral surface of each wall on both vertical sides of the case 22.

[0014] FIG. 5 is a view showing the cover 23. As shown in FIG. (a) in the figure shows the cover 23 as viewed from one side in the width direction, from the outside in the vertical direction, and from the front in the depth direction. (b) in the figure shows the cover 23 as viewed from the front in the depth direction. (c) in the figure shows a cross section of the cover 23, taken along the vertical and depth directions and passing through the center in the width direction, as viewed from one side in the width direction. The cover 23 is made of insulating resin, and is closed on both sides in the width direction, both sides in the vertical direction, and at the front in the depth direction, and open at the back in the depth direction.

[0015] The front wall of the cover 23 in the depth direction has a vertical outer side displaced toward the back in the depth direction via a step, and an electric wire insertion hole 51 and a tool insertion hole 52 are formed on each of the inner and outer vertical sides. The electric wire insertion hole 51 penetrates the wall of the cover 23 in the depth direction and is shaped to allow a ferrule terminal to be inserted. The tool insertion hole 52 penetrates the wall of the cover 23 in the depth direction and is shaped to allow a tool such as a flathead screwdriver to be inserted. The two electric wire insertion holes 51 and the two tool insertion holes 52 are aligned in a row along the vertical direction as viewed from the depth direction. A terminal cover portion 53 is formed on the outer peripheral surface of the inner wall of the cover 23 in the vertical direction. The terminal cover portion 53 is formed to protrude inward in the vertical direction to cover the screw terminal 12, is widened according to the width dimension of the square washer of the screw terminal 12, and has a rectangular outline with four corners as viewed from the depth direction. Recesses 54 penetrating vertically are formed in both vertical wall portions of the cover 23. The cover 23 is fitted onto the outside of the case 22 from the front in the depth direction, and is fixed by fitting the recesses 54 and the protrusions 43 together, which form a snap fit.

[0016] FIG. 6 is a diagram showing the leaf spring 24. As shown in FIG. Here, the leaf spring 24 is shown as viewed from one side in the width direction, from the outside in the vertical direction, and from the front in the depth direction. The leaf spring 24 is made of a conductive metal, is bent at an R so as to be convex toward the front in the depth direction, and is formed in a V shape that opens toward the back in the depth direction when viewed from the width direction. The base end side of the leaf spring 24 extends in the depth direction and is a flat plate along the depth direction and width direction, and the tip side of the leaf spring 24 is a flat plate along the width direction that extends toward the back in the depth direction as it approaches the outside in the vertical direction. The leaf spring 24 is fitted into the case 22 from one side in the width direction, and is held in the case 22 with the base end side in contact with the side of the internal partition wall 42 along the depth direction.

[0017] FIG. 7 is a diagram showing case 22. FIG. 1(a) shows the case 22 with the conductive plate 21 and leaf spring 24 assembled, as viewed from one side in the width direction, from the outside in the vertical direction, and from the front in the depth direction. FIG. 1(b) shows the case 22 with the conductive plate 21 and leaf spring 24 assembled, as viewed from one side in the width direction. The conductive plate 21 is first fitted into the case 22, and then the two leaf springs 24 are fitted into it. The leaf springs 24 are fitted together with their tip ends pressed toward the base ends to bend them slightly, and their respective tip ends are pressed against the receiving plate 33 of the substrate 31 and the receiving plate 34 of the joining plate 32 by repulsive forces.

[0018] FIG. 8 is a diagram showing an electric device 11. As shown in FIG. Here, the electrical device 11 with the case 22 attached to one screw terminal 12 of the main circuit is shown as viewed from one side in the width direction, the other side in the vertical direction, and from the front in the depth direction. First, the screw terminal 12 is removed from the electrical device 11, the case 22 is inserted therein, and the screw terminal 12 is inserted into the terminal plate 35 and fastened, thereby fixing the case 22 to the electrical device 11 via the conductive plate 21. Then, the cover 23 is fitted onto the case 22 and fixed. FIG. 9 is a diagram showing an electric device 11. As shown in FIG. Here, the electrical device 11 is shown as seen from the front in the depth direction, with wiring connection devices 13 attached to all screw terminals 12 of the main circuit. The wiring connection devices 13 are attached independently to each pole of the electrical device 11, and are spaced apart from adjacent poles in the width direction with a small gap between them. FIG. 10 is a diagram showing an electric device 11. As shown in FIG. Here, the electrical device 11 with wiring connection devices 13 attached to all screw terminals 12 of the main circuit is shown as seen from one side in the width direction, the other side in the vertical direction, and from the front in the depth direction.

[0019] FIG. 11 is a diagram showing how the electric wire 61 is inserted. Here, a cross section of the wiring connection device 13 passing through the center in the width direction and along the vertical and depth directions is shown as viewed from one side in the width direction. A collared ferrule terminal 62 is crimped to the tip of an electric wire 61. When the ferrule terminal 62 is inserted into the electric wire insertion hole 51, the leaf spring 24 is pushed by the ferrule terminal 62 and elastically deforms, and the ferrule terminal 62 is inserted between the tip and the receiving plate 34. The ferrule terminal 62 is pressed against the receiving plate 34 by the elastic force of the leaf spring 24, and is electrically connected to the main circuit with displacement in the pull-out direction suppressed. FIG. 12 is a diagram showing the insertion of the tool 63. As shown in FIG. Here, a cross section of the wiring connection device 13, which passes through the center in the width direction and is aligned in the vertical and depth directions, is shown as viewed from one side in the width direction. For example, a flat head screwdriver is used as the tool 63. When the tool 63 is inserted into the tool insertion hole 52, the leaf spring 24 is pushed by the tool 63 and elastically deforms, allowing the ferrule terminal 62 to be pulled out.

[0020] <Action and Effect> Next, main effects of the embodiment will be described. The wiring connection device 13 includes a conductive plate 21, a case 22, a cover 23, and a leaf spring 24. The conductive plate 21 is inserted into the screw terminal 12 of the electric device 11 and fixed. The case 22 holds the conductive plate 21. The cover 23 covers the case 22 and has an electric wire insertion hole 51 formed therein. The leaf spring 24 is a leaf spring 24 held by the case 22, and presses the electric wire 61 inserted into the electric wire insertion hole 51 against the conductive plate 21. The wiring connection device 13 is independently attached to the electric device 11 for each pole. This allows attachment to multiple models of screw terminals 12 with the same diameter. Therefore, there is no need to design the wiring connection device 13 for each model of the electric device 11, and an increase in costs can be suppressed. The wiring connection device 13 allows the electric wire 61 to be connected to the screw terminal 12 simply by inserting the electric wire 61 into the electric wire insertion hole 51. Therefore, simply by adding the wiring connection device 13, the connection to the screw terminal 12 can be converted to a plug-in type, improving the workability of connecting electric wires.

[0021] The direction in which the conductive plate 21 is inserted into the screw terminal 12 is defined as the vertical direction. The cover 23 is formed with two electric wire insertion holes 51 aligned vertically. The case 22 holds two leaf springs 24 aligned vertically. The conductive plate 21 includes a substrate 31 and a joint plate 32. One vertical end of the substrate 31 protrudes from the case 22 and is inserted into the screw terminal 12, and the electric wire 61 is pressed against the other vertical end by one of the leaf springs 24. The joint plate 32 is joined to the substrate 31, and the electric wire 61 is pressed against the other leaf spring 24. In this way, the substrate 31 and the joint plate 32 are formed separately and joined later, so that it is not necessary to form a single plate material by press processing including hemming. Hemming is a process of folding 180 degrees and crushing flat, so that it is limited to a thickness and a soft material that is easy to bend, and there is a risk of scratches at the folding point. By avoiding such hemming, there are no restrictions on thickness or material, and the risk of scratches occurring during processing is eliminated.

[0022] One end of the board 31 in the vertical direction is widened to match the width of the screw terminal 12. This makes it possible to suppress rattling of the wiring connection device 13 that is attached independently for each pole. The axial direction of the screw terminals 12 is defined as the depth direction. The cover 23 is fitted into the case 22 in the depth direction. This allows the covers 23 to be attached and detached individually without the wiring connection devices 13 adjacent in the width direction interfering with each other. The direction in which the conductive plate 21 is inserted into the screw terminal 12 is defined as the vertical direction. The cover 23 is formed with a terminal cover portion 53 that protrudes from one vertical end and covers the screw terminal 12. One vertical end of the terminal cover portion 53 is widened to match the width of the screw terminal 12. This makes it possible to suppress rattling of the wiring connection device 13 that is attached independently for each pole, and also provides an IP20 function to prevent electric shock to the user.

[0023] Next, a comparative example will be described. To improve the efficiency of the connection work, a push-in structure or a spring terminal structure is known in which a connection device is added to the screw terminal 12 of the electric device 11, and the electric wire 61 can be connected simply by inserting the leaf spring. Here, a comparative example is shown in which leaf springs for three poles are integrated into one unit. Since the housing structure and the pitch of the screw terminal 12 differ depending on the model of the electric device 11, a connection device with multiple poles integrated must be designed for each model of the electric device 11, resulting in increased costs.

[0024] <<Variation>> In the embodiment, the configuration in which the wiring connection device 13 is attached to the electromagnetic contactor has been described, but the present invention is not limited to this. In addition, the present invention can be applied to other electric devices 11, such as a circuit breaker, an auxiliary switch of a terminal block type which is an accessory, and an alarm switch of a terminal block type. In other words, the present invention can be applied to any other electric devices and accessories as long as they clamp electric wires with screw terminals. In the embodiment, the wiring connection device 13 is attached to the main circuit of the electromagnetic contactor. However, the present invention is not limited to this, and the wiring connection device 13 may be attached to a screw terminal of an auxiliary circuit or a control circuit.

[0025] 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]

[0026] 11...electrical equipment, 12...screw terminal, 13...wiring connection device, 21...conductive plate, 22...case, 23...cover, 24...leaf spring, 31...substrate, 32...joint plate, 33...receiving plate, 34...receiving plate, 35...terminal plate, 41...opening, 42...internal partition wall, 43...projection, 51...electric wire insertion hole, 52...tool insertion hole, 53...terminal cover part, 54...recess, 61...electric wire, 62...ferrule terminal, 63...tool

Claims

1. A conductive plate that is inserted into and fixed to a screw terminal of an electrical device; A case for holding the conductive plate; a cover that covers the case and has an electric wire insertion hole formed therein; a leaf spring held by the case, the leaf spring pressing the electric wire inserted into the electric wire insertion hole against the conductive plate, A wiring connection device that can be attached independently to each pole of the electrical equipment.

2. The direction in which the conductive plate is inserted into the screw terminal is the vertical direction, The cover is formed with two wire insertion holes aligned in a vertical direction, The case holds two of the leaf springs aligned in a vertical direction, The conductive plate is a substrate having one end in a vertical direction protruding from the case and inserted into the screw terminal, and having another end in a vertical direction against which the electric wire is pressed by one of the leaf springs; 2. The wiring connection device according to claim 1, further comprising: a joining plate joined to the base plate, against which the electric wires are pressed by the other of the leaf springs.

3. 3. The wiring connection device according to claim 2, wherein one end side of the board in the vertical direction is widened to match the width of the screw terminal.

4. The axial direction of the screw terminal is defined as a depth direction, 2. The wiring connector according to claim 1, wherein the cover is fitted to the case in a depth direction.

5. The direction in which the conductive plate is inserted into the screw terminal is the vertical direction, The cover is formed with a terminal cover portion that protrudes from one end in a vertical direction and covers the screw terminals.

2. The wiring connector according to claim 1, wherein one end of the terminal cover in the vertical direction is widened to match the width of the screw terminal.

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