Lamp lifter

Abstract

The utility model discloses a lamp lifter which comprises a hanging base, a wire spool, a conductive assembly and a second wire, and a rotating shaft is arranged on the end face of the hanging base. One end of the wire spool is rotatably connected with the rotating shaft, and the wire spool is used for winding a first wire; the conductive assembly is arranged in the wire spool and comprises an insulating top seat, an insulating base, a first conductive elastic piece and a first conductive ring piece, an insulating column body is arranged in the middle of the end face of the insulating top seat, the first conductive elastic piece and the first conductive ring piece are sequentially arranged on the insulating column body in a sleeving mode, and the first conductive elastic piece and the first conductive ring piece are in electric contact and can rotate relatively; the peripheral wall of the first conductive ring piece is fixedly connected with a wire spool, one end of the first wire is connected with the lamp, and the other end of the first wire extends into the wire spool and is electrically connected with the first conductive ring piece; the second wire extends into the wire spool through the rotating shaft and is electrically connected with the first conductive elastic sheet. According to the embodiment of the utility model, the problem that the conductor wire is damaged due to frequent rotation can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of suspension lamp lifting, in particular to a lamp lifter. Background Art

[0002] A hanging lamp is a common lighting fixture, typically consisting of a hanging base and a lamp connected to it. While this structure can meet general usage requirements, the conventional structure prevents the lamp from being adjusted upwards or downwards, limiting its applicability and practicality. Prior art systems utilize a winding coil with a conductive wire connected to the lamp at one end and an external power source at the other. The coil is rotated to pull out the conductive wire, allowing the height of the lamp to be adjusted. However, since the external power source is typically fixed, frequent rotation of the wire can damage the end connected to the external power source, reducing its service life. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a lamp lifter that can effectively prevent the conductive wire from being damaged due to frequent rotation, thereby extending its service life.

[0004] According to the utility model, a lamp lifter includes a suspension seat, a winding drum, a conductive component and a second wire, the end surface of the suspension seat is provided with a rotating shaft; one end of the winding drum is rotatably connected to the rotating shaft, and the winding drum is used to wind a first wire; the conductive component is arranged in the winding drum, and the conductive component includes an insulating top seat, an insulating base, a first conductive spring and a first conductive ring piece. An insulating cylinder is provided in the middle of the end surface of the insulating top seat, the end of the insulating cylinder is fixedly connected to one end of the insulating base, and the other end of the insulating base is fixedly connected to the end of the rotating shaft. The first conductive spring and the first conductive ring piece are sequentially sleeved on the insulating cylinder, the first conductive spring and the first conductive ring piece are electrically contacted and can rotate relative to each other, and the outer peripheral wall of the first conductive ring piece is fixedly connected to the winding drum, one end of the first wire is connected to the lamp, and the other end of the first wire extends into the winding drum and is electrically connected to the first conductive ring piece; one end of the second wire is electrically connected to an external power supply, and the other end of the second wire extends into the winding drum through the rotating shaft and is electrically connected to the first conductive spring.

[0005] The lamp lifter according to the above embodiment of the utility model has at least the following beneficial effects:

[0006] The lamp lifter provided by the embodiment of the present invention is fixedly connected to the winding disk by setting a first conductive ring piece, so that the first conductive ring piece can rotate with the winding disk, and the end of the first wire electrically connected to the first conductive ring piece is relatively stationary with the first conductive ring piece. At the same time, by utilizing the relative rotation characteristics and electrical contact characteristics between the first conductive spring piece and the first conductive ring piece, when the first conductive ring piece rotates with the winding disk, the first conductive spring piece can maintain contact with the first conductive ring piece while maintaining conductivity and remaining stationary, thereby allowing the end of the second wire electrically connected to the first conductive spring piece to remain stationary, effectively solving the problem that the conductive wire in the traditional structure is easily damaged due to frequent rotation, greatly improving the stability and safety of the system, and extending the service life of the conductive wire.

[0007] According to some embodiments of the present invention, the conductive component also includes an insulating ring piece, a second conductive spring piece and a second conductive ring piece. The first conductive spring piece, the first conductive ring piece, the insulating ring piece, the second conductive spring piece and the second conductive ring piece are sequentially sleeved on the insulating cylinder in a direction away from the insulating top seat. The first wire includes a first live wire and a first neutral wire. The first live wire and the first neutral wire are electrically connected to the first conductive ring piece and the second conductive ring piece respectively. The second wire includes a second live wire and a second neutral wire. The second live wire and the second neutral wire are electrically connected to the first conductive spring piece and the second conductive spring piece respectively.

[0008] According to some embodiments of the present invention, the first conductive spring piece and the second conductive spring piece are both elastic, and both the first conductive spring piece and the second conductive spring piece are wavy along the axial direction of the rotating shaft.

[0009] According to some embodiments of the present invention, the outer edge of the first conductive ring piece is provided with a first conductive copper piece extending outward, and the first conductive copper piece is fixedly connected to the winding disk. The outer edge of the second conductive ring piece is provided with a second conductive copper piece extending outward, and the second conductive copper piece is fixedly connected to the winding disk. The first live wire and the first neutral wire are electrically connected to the first conductive copper piece and the second conductive copper piece respectively.

[0010] According to some embodiments of the present invention, a first connecting column is provided at the bottom of the winding reel, and the first connecting column extends along the axial direction of the rotating shaft to the first conductive copper sheet. A first connecting hole is provided at the end of the first connecting column, and a first through hole is provided at the first conductive copper sheet. The first connecting hole and the first through hole are fixedly connected by a first bolt.

[0011] According to some embodiments of the present invention, the first conductive ring piece is provided with two first conductive copper pieces, and the two first conductive copper pieces are symmetrically arranged on both sides of the first conductive ring piece. The first live wire is electrically connected to one of the first conductive copper pieces, and the winding reel is correspondingly provided with two first connecting columns.

[0012] According to some embodiments of the present invention, a second connecting column is provided at the bottom of the winding reel, and the second connecting column extends along the axial direction of the rotating shaft to the second conductive copper sheet. A second connecting hole is provided at the end of the second connecting column, and a second conductive copper sheet is provided with a second through hole. The second connecting hole and the second through hole are fixedly connected by a second bolt.

[0013] According to some embodiments of the present invention, the second conductive ring piece is provided with two second conductive copper pieces, and the two second conductive copper pieces are symmetrically arranged on both sides of the second conductive ring piece. The first neutral line is electrically connected to one of the second conductive copper pieces, and the winding reel is correspondingly provided with two second connecting columns.

[0014] According to some embodiments of the present invention, a third conductive copper sheet is provided on the inner edge of the first conductive spring sheet, a fourth conductive copper sheet is provided on the inner edge of the second conductive spring sheet, and the second live wire and the second neutral wire are electrically connected to the third conductive copper sheet and the fourth conductive copper sheet respectively.

[0015] According to some embodiments of the present invention, the rotating shaft is provided with two first wire passing holes, which extend along the axial direction of the rotating shaft and pass through the rotating shaft. The insulating base is correspondingly provided with two second wire passing holes, and the second live wire and the second neutral wire pass through the first wire passing hole and the second wire passing hole respectively in sequence.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0018] Figure 1 It is a cross-sectional view of a lamp lifter according to some embodiments of the present invention;

[0019] Figure 2 This is a partial structural diagram of a lamp lifter according to some embodiments of the present invention;

[0020] Figure 3 Schematic diagram of the structure of the conductive components of some embodiments of the present invention;

[0021] Figure 4 1 is an exploded view of the conductive components of some embodiments of the present invention.

[0022] Wherein, the reference numerals:

[0023] Suspension seat 100; rotating shaft 110; first wire hole 111;

[0024] Winding reel 200; first connecting post 210;

[0025] Conductive component 300; insulating top seat 310; insulating column 311; insulating base 320; second wire hole 321; first conductive spring 330; third conductive copper sheet 331; first conductive ring 340; first conductive copper sheet 341; first through hole 342; insulating ring 350; second conductive spring 360; fourth conductive copper sheet 361; second conductive ring 370; second conductive copper sheet 371; second through hole 372;

[0026] A second live wire 410 ; a second neutral wire 420 . DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0029] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0030] In the description of this utility model, unless otherwise expressly defined, terms such as "set," "install," and "connect" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meanings of these terms in the present utility model based on the specific content of the technical solution. In the description of this utility model, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with such embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of these terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples. In the description of this specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with such embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of these terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0031] Reference Figures 1 to 4 According to the utility model, a lamp lifter includes a suspension seat 100, a winding drum 200, a conductive component and a second wire. The end surface of the suspension seat 100 is provided with a rotating shaft 110; one end of the winding drum 200 can be rotatably connected to the rotating shaft 110, and the winding drum 200 is used to wind the first wire; the conductive component is arranged in the winding drum 200, and the conductive component includes an insulating top seat 310, an insulating base 320, a first conductive spring 330 and a first conductive ring piece 340. An insulating column 311 is provided in the middle of the end surface of the insulating top seat 310, and the end of the insulating column 311 is fixedly connected to one end of the insulating base 320. The other end of 320 is fixedly connected to the end of the rotating shaft 110, and the first conductive spring piece 330 and the first conductive ring piece 340 are sequentially sleeved on the insulating cylinder 311. The first conductive spring piece 330 and the first conductive ring piece 340 are in electrical contact and can rotate relative to each other. The outer peripheral wall of the first conductive ring piece 340 is fixedly connected to the winding reel 200. One end of the first wire is connected to the lamp, and the other end of the first wire extends into the winding reel 200 and is electrically connected to the first conductive ring piece 340; one end of the second wire is electrically connected to the external power supply, and the other end of the second wire extends into the winding reel 200 through the rotating shaft 110 and is electrically connected to the first conductive spring piece 330.

[0032] It can be understood that the lamp lifter provided by the embodiment of the present invention is fixedly connected to the winding reel 200 by setting a first conductive ring piece 340, so that the first conductive ring piece 340 can rotate with the winding reel 200, and the end of the first wire electrically connected to the first conductive ring piece 340 is relatively stationary with the first conductive ring piece 340. At the same time, by utilizing the relative rotation characteristics and electrical contact characteristics between the first conductive spring piece 330 and the first conductive ring piece 340, when the first conductive ring piece 340 rotates with the winding reel 200, the first conductive spring piece 330 can maintain contact with the first conductive ring piece 340 while maintaining electrical conductivity, thereby allowing the end of the second wire electrically connected to the first conductive spring piece 330 to remain stationary, thereby achieving electrical conduction between the external power supply and the lamp, and effectively solving the problem of the conductive wire in the traditional structure being easily damaged due to frequent rotation, greatly improving the stability and safety of the system, and extending the service life of the conductive wire.

[0033] Further, refer to Figures 1 to 4 According to some embodiments of the present invention, the conductive component further includes an insulating ring piece 350, a second conductive spring piece 360 ​​and a second conductive ring piece 370. The first conductive spring piece 330, the first conductive ring piece 340, the insulating ring piece 350, the second conductive spring piece 360 ​​and the second conductive ring piece 370 are sequentially sleeved on the insulating cylinder 311 in a direction away from the insulating top seat 310. The first wire includes a first live wire and a first neutral wire, and the first live wire and the first neutral wire are electrically connected to the first conductive ring piece 340 and the second conductive ring piece 370 respectively. The second wire includes a second live wire 410 and a second neutral wire 420, and the second live wire 410 and the second neutral wire 420 are electrically connected to the first conductive spring piece 330 and the second conductive spring piece 360 ​​respectively.

[0034] It can be understood that by introducing the insulating ring piece 350, the second conductive spring piece 360 ​​and the second conductive ring piece 370, independent connection of the first live wire and the first neutral wire, the second live wire 410 and the second neutral wire 420 is achieved, the positive and negative lines are processed separately, the interference between circuits is reduced, the circuit layout is clearer and more reasonable, maintenance and troubleshooting are facilitated, and the safety and reliability of power supply are improved.

[0035] Preferably, according to some embodiments of the present invention, both the first conductive spring 330 and the second conductive spring 360 are elastic, and both the first conductive spring 330 and the second conductive spring 360 are wavy along the axial direction of the rotating shaft 110 .

[0036] It can be understood that the first conductive spring clip 330 and the second conductive spring clip 360 are elastic and can help maintain electrical contact. The wavy design can reduce the contact area, thereby reducing friction and making the rotation smoother. On the other hand, the wavy design can increase the elastic recovery ability, and can maintain a good electrical contact state even under frequent rotation, thereby improving the reliability of conduction.

[0037] Further, refer to Figure 3 and Figure 4 According to some embodiments of the present invention, the outer edge of the first conductive ring piece 340 is provided with a first conductive copper piece 341 extending outward, and the first conductive copper piece 341 is fixedly connected to the winding reel 200. The outer edge of the second conductive ring piece 370 is provided with a second conductive copper piece 371 extending outward, and the second conductive copper piece 371 is fixedly connected to the winding reel 200. The first live wire and the first neutral wire are electrically connected to the first conductive copper piece 341 and the second conductive copper piece 371 respectively.

[0038] It can be understood that by providing the first conductive copper sheet 341 and the second conductive copper sheet 371 extending outward, contact between the first live wire and the first neutral wire and other components can be avoided, thereby further improving the reliability of the electrical connection. By fixing the winding reel 200 with the first conductive copper sheet 341 and the second conductive copper sheet 371, the first conductive ring sheet 340 and the second conductive ring sheet 370 can rotate with the winding reel 200, and the end of the first live wire electrically connected to the first conductive copper sheet 341 and the first conductive ring sheet 340 are relatively stationary. By utilizing the relative rotation characteristics and electrical contact characteristics between the first conductive spring sheet 330 and the first conductive ring sheet 340, when the first conductive ring sheet 340 rotates with the winding reel 200, the first conductive spring sheet 330 can maintain contact and conduction with the first conductive ring sheet 340 while remaining stationary, thereby allowing the end of the second live wire 410 electrically connected to the first conductive spring sheet 330 to remain stationary. Similarly, the end of the first neutral wire electrically connected to the second conductive copper sheet 371 is relatively stationary with the second conductive ring piece 370. By utilizing the relative rotation characteristics and electrical contact characteristics between the second conductive spring piece 360 ​​and the second conductive ring piece 370, when the second conductive ring piece 370 rotates with the winding reel 200, the second conductive spring piece 360 ​​can maintain contact and conduction with the second conductive ring piece 370 while remaining stationary, thereby allowing the end of the second neutral wire 420 electrically connected to the second conductive spring piece 360 ​​to remain stationary, effectively solving the problem of the conductive wire being easily damaged due to frequent rotation in the traditional structure, greatly improving the stability and safety of the system, and extending the service life of the conductive wire.

[0039] Further, refer to Figure 1 and Figure 3According to some embodiments of the present invention, a first connecting column 210 is provided at the bottom of the winding reel 200, and the first connecting column 210 extends along the axial direction of the rotating shaft 110 to the first conductive copper sheet 341. A first connecting hole is provided at the end of the first connecting column 210, and a first through hole 342 is provided at the first conductive copper sheet 341. The first connecting hole and the first through hole 342 are fixedly connected by a first bolt, which simplifies the assembly process between the first conductive copper sheet 341 and the winding reel 200 and improves production efficiency.

[0040] Further, refer to Figure 1 and Figure 3 According to some embodiments of the present invention, the first conductive ring piece 340 is provided with two first conductive copper pieces 341, and the two first conductive copper pieces 341 are symmetrically arranged on both sides of the first conductive ring piece 340. The first live wire is electrically connected to one of the first conductive copper pieces 341, and the winding reel 200 is correspondingly provided with two first connecting columns 210, which is beneficial to improving the stability of the overall structure.

[0041] Further, refer to Figure 3 and Figure 4 According to some embodiments of the present invention, a second connecting column is provided at the bottom of the winding reel 200, and the second connecting column extends along the axial direction of the rotating shaft 110 to the second conductive copper sheet 371. A second connecting hole is provided at the end of the second connecting column, and the second conductive copper sheet 371 is provided with a second through hole 372. The second connecting hole and the second through hole 372 are fixedly connected by a second bolt, which simplifies the assembly process between the second conductive copper sheet 371 and the winding reel 200 and improves production efficiency.

[0042] Further, refer to Figure 3 and Figure 4 According to some embodiments of the present invention, the second conductive ring piece 370 is provided with two second conductive copper pieces 371, and the two second conductive copper pieces 371 are symmetrically arranged on both sides of the second conductive ring piece 370. The first neutral line is electrically connected to one of the second conductive copper pieces 371, and the winding reel 200 is correspondingly provided with two second connecting columns, which is beneficial to improving the stability of the overall structure.

[0043] Further, refer to Figure 4 According to some embodiments of the present invention, a third conductive copper sheet 331 is provided on the inner edge of the first conductive spring sheet 330, and a fourth conductive copper sheet 361 is provided on the inner edge of the second conductive spring sheet 360. The second live wire 410 and the second neutral wire 420 are electrically connected to the third conductive copper sheet 331 and the fourth conductive copper sheet 361 respectively, thereby optimizing the design of the internal conductive path and ensuring the high efficiency and stability of current transmission.

[0044] Further, refer to Figure 1 and Figure 4According to some embodiments of the present invention, the rotating shaft 110 is provided with two first wire-passing holes 111, which extend along the axial direction of the rotating shaft 110 and pass through the rotating shaft 110. The insulating base 320 is correspondingly provided with two second wire-passing holes 321, and the second live wire 410 and the second neutral wire 420 pass through the first wire-passing hole 111 and the second wire-passing hole 321 respectively.

[0045] It can be understood that through the coordinated use of the first wire passing hole 111 and the second wire passing hole 321, the second live wire 410 and the second neutral wire 420 can pass through the corresponding first wire passing hole 111 and the second wire passing hole 321 respectively, avoiding direct contact between the wires and the winding reel 200, reducing the entanglement and friction of the wires, and improving the reliability and service life of the system.

[0046] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A lamp lifter, characterized in that: include: A suspension seat, wherein the end surface of the suspension seat is provided with a rotating shaft; a winding drum, one end of which is rotatably connected to the rotating shaft, and the winding drum is used to wind a first conductive wire; A conductive component is disposed in the winding reel, the conductive component comprising an insulating top seat, an insulating base, a first conductive spring piece, and a first conductive ring piece. An insulating cylinder is provided in the middle of the end surface of the insulating top seat, an end of the insulating cylinder is fixedly connected to one end of the insulating base, and the other end of the insulating base is fixedly connected to the end of the rotating shaft. The first conductive spring piece and the first conductive ring piece are sequentially sleeved on the insulating cylinder, the first conductive spring piece is in electrical contact with the first conductive ring piece and can rotate relative to each other, the outer peripheral wall of the first conductive ring piece is fixedly connected to the winding reel, one end of the first wire is connected to the lamp, and the other end of the first wire extends into the winding reel and is electrically connected to the first conductive ring piece; A second wire, one end of which is electrically connected to an external power source, and the other end of which extends into the winding drum through the rotating shaft and is electrically connected to the first conductive elastic sheet.

2. The lamp lifter according to claim 1, characterized in that: The conductive component also includes an insulating ring piece, a second conductive spring piece and a second conductive ring piece. The first conductive spring piece, the first conductive ring piece, the insulating ring piece, the second conductive spring piece and the second conductive ring piece are sequentially sleeved on the insulating cylinder in a direction away from the insulating top seat. The first wire includes a first live wire and a first neutral wire. The first live wire and the first neutral wire are electrically connected to the first conductive ring piece and the second conductive ring piece respectively. The second wire includes a second live wire and a second neutral wire. The second live wire and the second neutral wire are electrically connected to the first conductive spring piece and the second conductive spring piece respectively.

3. The lamp lifter according to claim 2, characterized in that: The first conductive spring piece and the second conductive spring piece are both elastic, and both are wavy along the axial direction of the rotating shaft.

4. The lamp lifter according to claim 2, characterized in that: The outer edge of the first conductive ring piece is provided with a first conductive copper piece extending outward, and the first conductive copper piece is fixedly connected to the winding disk. The outer edge of the second conductive ring piece is provided with a second conductive copper piece extending outward, and the second conductive copper piece is fixedly connected to the winding disk. The first live wire and the first neutral wire are electrically connected to the first conductive copper piece and the second conductive copper piece respectively.

5. The lamp lifter according to claim 4, characterized in that: A first connecting column is provided at the bottom of the winding drum, and the first connecting column extends along the axial direction of the rotating shaft to the first conductive copper sheet. A first connecting hole is provided at the end of the first connecting column, and a first through hole is provided on the first conductive copper sheet. The first connecting hole and the first through hole are fixedly connected by a first bolt.

6. The lamp lifter according to claim 5, characterized in that: The first conductive ring piece is provided with two first conductive copper pieces, and the two first conductive copper pieces are symmetrically arranged on both sides of the first conductive ring piece. The first live wire is electrically connected to one of the first conductive copper pieces, and the winding reel is correspondingly provided with two first connecting columns.

7. The lamp lifter according to claim 4, characterized in that: A second connecting column is provided at the bottom of the winding reel, and the second connecting column extends along the axial direction of the rotating shaft to the second conductive copper sheet. A second connecting hole is provided at the end of the second connecting column, and a second through hole is provided at the second conductive copper sheet. The second connecting hole and the second through hole are fixedly connected by a second bolt.

8. The lamp lifter according to claim 7, characterized in that: The second conductive ring piece is provided with two second conductive copper pieces, and the two second conductive copper pieces are symmetrically arranged on both sides of the second conductive ring piece. The first neutral line is electrically connected to one of the second conductive copper pieces, and the winding reel is correspondingly provided with two second connecting columns.

9. The lamp lifter according to claim 2, characterized in that: A third conductive copper sheet is provided on the inner edge of the first conductive spring sheet, a fourth conductive copper sheet is provided on the inner edge of the second conductive spring sheet, and the second live wire and the second neutral wire are electrically connected to the third conductive copper sheet and the fourth conductive copper sheet respectively.

10. The lamp lifter according to claim 9, characterized in that: The rotating shaft is provided with two first wire passing holes, which extend along the axial direction of the rotating shaft and pass through the rotating shaft. The insulating base is correspondingly provided with two second wire passing holes, and the second live wire and the second neutral wire pass through the first wire passing hole and the second wire passing hole respectively.

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