JP6166035B2 - Grounding device, structure and method for grounding conductor having insulating layer on surface - Google Patents

Description

  The present invention relates to a grounding device and a grounding method.

  There are three types of grounding or ground (GND): signal ground (SG), frame ground (FG), and earth (E). In any case, the grounding target and the lead wire leading to the ground are securely connected. It is most important. Next, what is important is workability for easily connecting.

  Patent Document 1 discloses a technique for reliably and simply connecting an object to be grounded and a ground line.

  FIG. 19 is a sectional view showing this technique. The grounding device 101 includes a main body 102 made of a non-magnetic material, a permanent magnet 103, a spacer 104, and a stopper 105. The main body 102 is provided with a recess 102a for inserting the permanent magnet 103 and an insertion hole 102b for inserting a cable. The permanent magnet 103 is conductive, and a through hole is provided on the connection surface.

  The permanent magnet 103 is inserted into the recess 102 a of the main body 102 and attached to the main body by a stopper 105. The cable 106 is inserted into the insertion hole 102b. The permanent magnet 103 and the cable 106 are electrically connected by the stopper 105. The cable 106 is connected to the ground 107. A spacer 104 is provided between the recess 102 a and the permanent magnet 103.

  The grounding device 101 is attached to the grounding object 108 by the magnetic force of the permanent magnet 103. Further, when the permanent magnet 103 is in close contact with the grounding object 108, an electrical connection is formed.

  In this way, the grounding object 108 can be grounded by simply attaching the grounding tool 101 with one touch. For this reason, compared with the case where the connection is formed by screwing or welding, the grounding work becomes extremely simple. As is apparent from the above configuration, the present technology can be applied to the case where the grounding object 108 is a conductive magnetic material (not a non-magnetic material).

Japanese Utility Model Publication No. 62-59971

  However, Patent Document 1 has a problem that a connection cannot be formed if there is an insulating layer such as paint or insulating plating on the surface. In the case where there is an insulating layer, a process for removing it is necessary.

  In order to achieve the above object, a grounding device of the present invention is a grounding device for grounding an object that is attracted to an object by a magnetic force, and a magnetic force generating means that generates a magnetic force and serves as an adsorbing portion with the object. And a conductive protrusion that is provided integrally with the magnetic force generating means and protrudes toward the object side of the attracting portion, and a conductive means that moves the electric charge generated in the protrusion to the outside of the grounding device.

  The effect of the present invention is that even if there is an insulating layer on the surface to be grounded, it can be grounded easily.

It is sectional drawing which shows 1st Embodiment. It is sectional drawing which shows operation | movement of 1st Embodiment. It is sectional drawing which shows the modification of 1st Embodiment. It is sectional drawing which shows 2nd Embodiment. It is sectional drawing which shows 3rd Embodiment. It is sectional drawing which shows 4th Embodiment. It is sectional drawing which shows 5th Embodiment. It is sectional drawing which shows an example of 5th Embodiment. It is sectional drawing which shows 6th Embodiment. It is sectional drawing which shows 7th Embodiment. It is sectional drawing which shows 8th Embodiment. It is a perspective view which shows an example of 8th Embodiment. It is sectional drawing which shows 9th Embodiment. It is sectional drawing which shows 10th Embodiment. It is a perspective view which shows the example of application of 10th Embodiment. It is a perspective view which shows an example of 11th Embodiment. It is a perspective view which shows another example of 11th Embodiment. It is a perspective view which shows another example of 11th Embodiment. It is sectional drawing which shows the prior art.

Next, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a sectional view showing a first embodiment of the present invention. The grounding device 1 according to the present embodiment includes a conductive magnet 3 having a sharp protrusion 2 on a joint surface with a grounding object, a conductive wire 4 connected to the magnet 3, and a terminal for connecting and fixing the conductive wire 4 to the magnet 2. 5 and a stopper 6, and the conductive wire 4 is connected to the ground 7. Note that the terminal 5 and the stopper 6 are examples of the conductor connecting means, and other means such as welding, adhesion with a conductive adhesive, and fixation with an adhesive tape may be used. Further, although the number of the protrusions 2 depicted in FIG. 1 is two, the number is not limited to this, and an arbitrary number can be taken.

  The magnet 3 is a permanent magnet. Various materials can be used, but since the most popular ferrite magnets are brittle and easily broken, neodymium magnets or alnico magnets having excellent hardness are suitable.

  The grounding object 8 in the present embodiment is one in which an insulating layer 10 is formed on a conductor 9. The conductor 9 is, for example, iron, stainless steel having magnetism, and the insulating layer 10 is a thin film such as paint or insulating plating. Various cases are conceivable as the grounding object 8. For example, a casing of an electric device, an electronic circuit board, an arc welding work, and the like, and the present invention can be used for any of signal ground, frame ground, and earth.

  In the present embodiment, as shown in FIG. 1, the protrusion 2 penetrates the insulating layer 10 and is electrically connected to the conductor 9. With this configuration, the conductor 9 can be grounded.

  FIG. 2 is a cross-sectional view illustrating a method for attaching the grounding device 1 according to the present embodiment. Before the attachment, the conductor 9 is covered with an insulating layer 10 as shown in FIG. Next, when the protrusion grounding device 1 of the present embodiment is brought close to the grounding object 8, the grounding device 1 is attracted to the grounding object 8 by magnetic force, and the protrusion 2 causes the insulating layer to be attached to the grounding object as shown in FIG. It penetrates and the conductor 9 and the magnet 3 are connected. After attachment, the grounding device 1 is attracted to the grounding object 8 by magnetic force. Furthermore, since the protrusion 2 bites into the conductor 9, it is difficult to skid. For this reason, the grounding device 1 can be firmly fixed.

  As described above, according to the present embodiment, the conductor covered with the insulating layer can be grounded only by bringing the grounding tool 1 closer.

As shown in FIG. 3, it is obvious that the conductor can be grounded using the grounding device 1 of the present embodiment even when the grounding object 8 does not have the insulating layer 10.
(Second Embodiment)
FIG. 4 is a cross-sectional view showing a second embodiment of the present invention. In the grounding device 1 of the present embodiment, a corona discharge body 11 is provided as a means for releasing the electric charge generated in the protrusion 2 to the outside. The corona discharge body 11 is, for example, a conductive nonwoven fabric or a metal having a needle-like end. When a conductor having a needle-like end portion is charged, a non-uniform high electric field is generated around the end portion, and the electric charge is released and removed into the space. This phenomenon is called corona discharge, and static elimination sheets and wristbands using corona discharge are already on the market. The configuration of the present embodiment can be realized by connecting a corona discharger 11 such as a static electricity removing sheet to the magnet 3 with a conductive adhesive or the like. Further, the back surface of the magnet 3 may be processed by etching or sandblasting to directly form a needle-like structure. According to the present embodiment, static electricity can be removed without connecting the conductive wire 4 and the ground 7.
(Third embodiment)
FIG. 5 is a sectional view showing a second embodiment of the present invention. In the present embodiment, the surface of the grounding object 8 is a curved surface. In such a case, the joining surface of the magnet 3 may be shaped to match the grounding object 8. Thereby, grounding can be performed in exactly the same manner as in the first embodiment.
(Fourth embodiment)
FIG. 6 is a cross-sectional view showing a third embodiment of the present invention. In the present embodiment, the magnet 3 has a substantially spherical shape. It should be noted here that the magnet 3 is magnetized so that the protrusion 2 becomes a magnetic pole. This is due to the property that the magnet 3 is attracted to the grounding object 8 with the magnetic poles directed. By adopting such a shape, the magnetic field concentrates on the protrusion 3, so that a strong attracting force is generated and the protrusion 2 easily penetrates the insulating layer 10.
(Fifth embodiment)
FIG. 7 is a cross-sectional view showing a fourth embodiment of the present invention. In the present embodiment, a yoke 12 (a yoke) is used. A protrusion 12 a is provided at the tip of the yoke 12 that serves as a joint surface with the grounding object 8. The yoke 12 can concentrate the magnetic field on the yoke 12. Further, since the projection 12a is provided on the yoke 12, the magnet 3 is not required to have mechanical strength. For this reason, it is also possible to use a brittle ferrite magnet, for example. The conductor 9 is connected to the ground via the protrusion 12a and the yoke 12. If the magnet 3 is conductive, it may be connected via the magnet 3. A suitable material for the yoke 12 is a soft magnetic material such as iron, silicon steel, permalloy, or electromagnetic stainless steel.

FIG. 8 is a cross-sectional view showing an application example of the present embodiment. In this example, the structure 13 is present on the surface of the grounding object 8, and the grounding device 1 can be attached across the structure 13 by increasing the height of the yoke 12.
(Sixth embodiment)
FIG. 9 is a cross-sectional view showing the present embodiment. In the present embodiment, the corona discharger 11 is connected to the back surface of the yoke 12 in the same manner as in the second embodiment. By adopting this configuration, static electricity can be removed without ground connection by the conducting wire 4.
(Seventh embodiment)
FIG. 10 is a sectional view showing a seventh embodiment of the present invention. In the present embodiment, an insulating cover 14 is provided around the yoke 12. The insulating cover 14 can be formed of various types of vinyl, plastic, other resins, and the like. By providing the insulating cover 14, electric shock can be prevented. Since other configurations are the same as those of the fifth embodiment, description thereof is omitted. It goes without saying that the insulating cover 14 can be applied to other implementations.
(Eighth embodiment)
FIG. 11 is a cross-sectional view showing an eighth embodiment of the present invention. In the present embodiment, a conductor 15 with a protrusion, which is different from the yoke 12, is provided as a member for connecting to the conductor 9. The conductor 15 with protrusions is attached so that the protrusions 15a protrude from the joint surface of the yoke 12 to the grounding object 8. For example, it is fixed to the yoke 12 using a stopper 16. In the configuration of the present embodiment, the magnet 3 is responsible for generating magnetic force, the yoke 12 is attracting to the grounding object 8, and the conductor 15 with protrusions is penetrating and connecting the insulating layer 10. Since the functions are shared in this way, a material specialized for each function can be freely selected. For this reason, the magnet 3 may be a brittle thing, and the merit that the conductor 15 with a protrusion does not need to be a magnetic material is acquired. For example, if the hardness of the conductor 15 with protrusions is pursued and a cemented carbide such as WC-Co (tungsten carbide-cobalt) is used as the material, the insulating layer penetration force of the protrusions 15a can be increased.

FIG. 12 is a perspective view showing an example of the grounding device 1 to which the present embodiment is applied. A conductor with protrusions 15 is attached to the outside of the bottomed cylindrical yoke 12, and the tip 15 b is mounted flush with the end of the yoke 12 and includes a protrusion 15 a. The bottom portion 15 c is provided with a through hole and is fixed to the yoke 12 by a stopper 16. In addition, the conductor 14 with protrusions and the conductor 4 are electrically connected using the stopper 16.
(Ninth embodiment)
FIG. 13 is a cross-sectional view showing a ninth embodiment of the present invention. In the present embodiment, an auto punch 17 that presses the grounding device 1 toward the grounding object 8 is provided. In another embodiment, the protrusion 12a penetrates the insulating layer 10 by an attractive force due to a magnetic force. However, there may be a case where pressure alone is insufficient. In this case, for example, if the yoke 12 is struck with a hammer, the protrusion 12a can penetrate the insulating layer 10. However, there is a possibility that the grounding object 8 may be deformed by excessively smashing or the equipment existing in the grounding object 8 may be broken. is there. On the other hand, if the auto punch 17 is used as in the present embodiment, an optimal hitting force can always be given.

  Next, the configuration of the present embodiment will be described. For example, a screw hole is provided on the surface of the yoke 12 opposite to the grounding target 8, and the shaft 18 of the auto punch 17 is screwed together. Since the configuration of the grounding device 1 may be any one of the first to eighth embodiments, the description thereof is omitted.

  First, the auto punch 17 will be briefly described. The auto punch 17 is a hand tool that applies a striking force to an object through a shaft 18. When the cylinder 19 is pushed into the object, the hammer 21 strikes the shaft 18 by the action of the spring 20 and the shaft 18 can apply a striking force to the object.

Next, the operation of the present embodiment will be described. First, the tip 12a of the yoke 12 is brought into contact with the grounding object 8 as shown in FIG. Next, the cylinder 19 is pushed in. Accordingly, the hammer 21 moves to the rear of the cylinder 19 and the spring 20 is compressed. When the moving amount reaches a certain amount, the inner wall of the cylinder 19 moves the locking portion 22 provided on the hammer 21 to release the locking. Then, it becomes possible for the shaft 18 to enter the hollow portion 23 provided in the hammer 21, and the hammer 21 collides with a flange 24 (rib) fixed to the shaft 18 by the action of the spring 20. The impact is transmitted to the shaft 18 and the yoke 12 is pushed toward the grounding object 8. Thereby, as shown in FIG. 13B, the protrusion 12a penetrates the insulating layer 10, and the connection between the grounding device 1 and the grounding object 8 is completed.
(Tenth embodiment)
FIG. 14 is a sectional view showing a tenth embodiment of the present invention. In this embodiment, an electronic device or the like is connected to another device that is at the ground potential. The electronic device 25 is, for example, a device having a circuit, display means, and input / output means, and has a frame 26 made of a conductor. The grounding device 1 is fixed to one outer surface of the frame 26 using fixing means such as screws. The grounding device 1 is electrically connected to the frame 26. The casing 27 is a casing of a device larger than the electronic device 25, for example, and includes the conductor 9 and has the insulating layer 10 on the surface. The conductor 9 itself becomes a reference potential, that is, the ground 7. When the electronic device 25 is brought into contact with the housing 27 using the grounding device 1, the grounding device 1 penetrates the insulating layer 10 and the conductor 9 and the frame 26 are connected. With this configuration, the electronic device 25 can be grounded. As described above, the present invention can also be applied to the case where an insulating layer is present on the ground-side conductor.

Further, the grounding device 1 can be used to ground the housing 27 to the earth. An example is shown in FIG. The surface of the casing 27 is covered with the insulating layer 10, but the conductor 9 and the conductor 4 inside the casing 27 may be connected using the grounding device 1, and the conductor 4 may be connected to the earth ground 28.
(Eleventh embodiment)
In the present embodiment, another example in which a grounding device 1 is used to ground a device or the like is shown.

  FIG. 16 is a perspective view showing an example in which the arc welding machine 29 is used as a ground electrode for arc welding. The grounding device 1 can be attached to the coated steel plate 30 and welding can be performed using the welding rod 31.

  FIG. 17 is a partially broken perspective view showing an example in which grounding is performed for the purpose of reducing noise of the electronic circuit board 32. The ground electrode 33 of the electronic circuit board 32 and the casing 27 of the electric device are connected using the grounding device 1. In the present embodiment, a grounding device is used on the ground side as in the eighth embodiment.

FIG. 18 shows an example applied to the removal of static electricity of a portable device 34 such as a cellular phone or a remote controller. The grounding device 1 is attached to the portable device 34 covered with the insulating layer 10. In this application example, the second and sixth embodiments using the corona discharger 11 are applied. With this configuration, static electricity can be removed wirelessly.
(Appendix 1)
A grounding device for attracting an object by a magnetic force and grounding the object, the magnetic force generating means for generating a magnetic force and serving as a suction portion with the object, and the magnetic force generating means provided integrally with the suction portion A grounding device comprising: a conductive protrusion protruding toward the object side; and a conductive means for moving a charge generated in the protrusion to the outside of the grounding device.
(Appendix 2)
The grounding device according to claim 1, wherein the magnetic force generating means includes a permanent magnet.
(Appendix 3)
The grounding device according to appendix 2, wherein the permanent magnet is conductive and the protrusion is provided integrally with the permanent magnet.
(Appendix 4)
The grounding device according to claim 2, wherein the magnetic force generating means includes a yoke that contacts the permanent magnet.
(Appendix 5)
The grounding device according to claim 4, wherein the yoke is conductive, and the protrusion is provided on the suction portion of the yoke.
(Appendix 6)
The grounding device according to claim 4, wherein the protrusion is made of a conductive member different from the yoke and is fixed to the yoke.
(Appendix 7)
The grounding device according to any one of appendix 1 to appendix 6, wherein the conductive means is connected to a corona discharge body.
(Appendix 8)
The grounding device according to any one of appendix 1 to appendix 7, wherein the grounding device includes an auto punch fixed to a surface of the magnetic force generating means opposite to the attraction portion.
(Appendix 9)
A structure comprising a conductor having an insulating layer on a surface thereof and a grounding device that comes into contact with the insulating layer, wherein the grounding device is provided integrally with the protrusion and a conductive protrusion penetrating the insulating layer. A structure having magnetic force generating means that abuts on an object, and conductive means that moves electric charges generated on the protrusion to the outside of the grounding device.
(Appendix 10)
A method of grounding a conductor having an insulating layer on a surface,
Magnetic force generating means for generating a magnetic force and serving as an adsorbing portion for the conductor, a conductive protrusion that is provided integrally with the magnetic force generating means and protrudes outward from the adsorbing portion, and charges generated in the protrusion are A grounding device having conductive means for moving the device to the outside,
A method for grounding a conductor having an insulating layer on a surface, the method comprising: bringing the protrusion close to the insulating layer; and attracting the grounding device to the insulating layer by magnetic force.
(Appendix 11)
The installation tool has an auto punch fixed to the surface of the magnetic force generating means opposite to the suction portion, and the conductor is connected to the grounding tool by the auto punch after the step of sucking the grounding tool. A method for grounding a conductor having an insulating layer on a surface thereof according to claim 10, further comprising a step of applying pressure in the direction.

DESCRIPTION OF SYMBOLS 1 Grounding tool 2 Protrusion 3 Magnet 4 Conductor 5 Terminal 6 Stopper 7 Ground 8 Grounding object 9 Conductor 10 Insulating layer 11 Corona discharge body 12 Yoke 13 Structure 14 Insulation cover 15 Protrusion conductor 16 Stopper 17 Auto punch 18 Shaft 19 Cylinder DESCRIPTION OF SYMBOLS 20 Spring 21 Hammer 22 Locking part 23 Hollow part 24 ２５ 25 Electronic device 26 Frame 27 Case 28 Earth ground 29 Arc welding machine 30 Painted steel plate 31 Welding rod 32 Electronic circuit board 33 Ground electrode 34 Portable device 101 Grounding instrument 102 Main body 103 Permanent magnet 104 Spacer 105 Stopper 106 Cable 107 Ground 108 Grounding object 109 Conductor

Claims (4)

A grounding device for attracting an object by magnetic force and grounding the object,
A magnetic force generating means for generating a magnetic force and serving as an adsorbing portion with the object;
A conductive protrusion provided integrally with the magnetic force generating means and protruding toward the object side of the suction portion;
Conductive means for moving the charge generated in the protrusion to the outside of the grounding device,
The magnetic force generating means has a substantially spherical shape.   The grounding device according to claim 1, wherein the magnetic force generation means includes a permanent magnet.   The grounding device according to claim 2, wherein the permanent magnet is conductive, and the protrusion is provided integrally with the permanent magnet.   The grounding device according to any one of claims 1 to 3, wherein the conductive means is connected to a corona discharge body.